With the disappearance for the username field from the Bitbucket UI, Linky fails to parse responses

value failed for JSON property username due to missing (therefore NULL) value for creator parameter username which is a non-nullable type

username used to be a non-null element in API responses, but it has been removed as part of GDPR.

2019-05-15 15:48:17,153 [67434163]   INFO -            BitbucketReferences - FROM: https://api-staging.bb-inf.net/2.0/repositories/bitbucket/bitbucket/commit/9bda9245554e97b341b2ba04d411b88d7080d726/pullrequests?fields=page%2Cpagelen%2Csize%2Cprevious%2Cnext%2Cvalues.author.links.avatar.href%2Cvalues.author.display_name%2Cvalues.author.username%2Cvalues.links.html.href%2Cvalues.id%2Cvalues.title%2Cvalues.state%2Cvalues.description%2Cvalues.created_on%2Cvalues.updated_on%2Cvalues.destination.branch.name%2Cvalues.destination.commit.hash%2Cvalues.destination.repository.name%2Cvalues.destination.repository.full_name%2Cvalues.source.branch.name%2Cvalues.source.commit.hash%2Cvalues.source.repository.name%2Cvalues.source.repository.full_name%2Cvalues.reviewers.username%2Cvalues.reviewers.display_name%2Cvalues.reviewers.links.avatar.href 
2019-05-15 15:48:17,505 [67434515]  ERROR -            BitbucketReferences - Failed to fetch related Pull Requests for BitbucketCloudRepository{bitbucket/bitbucket} 
com.atlassian.bitbucket.cloud.rest.MalformedResponse: Malformed response for 'commit pull requests' API endpoint
    at com.atlassian.bitbucket.cloud.rest.common.ErrorsKt.mapErrors(errors.kt:45)
    at com.atlassian.bitbucket.cloud.rest.common.ErrorsKt$mapErrors$1.invokeSuspend(errors.kt)
    at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:32)
    at io.ktor.util.pipeline.SuspendFunctionGun.resumeRootWith(PipelineContext.kt:211)
    at io.ktor.util.pipeline.SuspendFunctionGun.access$resumeRootWith(PipelineContext.kt:63)
    at io.ktor.util.pipeline.SuspendFunctionGun$continuation$1.resumeWith(PipelineContext.kt:114)
    at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:45)
    at kotlinx.coroutines.DispatchedTask.run(Dispatched.kt:233)
    at com.intellij.openapi.application.TransactionGuardImpl$2.run(TransactionGuardImpl.java:315)
    at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.doRun(LaterInvocator.java:435)
    at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.runNextEvent(LaterInvocator.java:419)
    at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.run(LaterInvocator.java:403)
    at java.desktop/java.awt.event.InvocationEvent.dispatch(Unknown Source)
    at java.desktop/java.awt.EventQueue.dispatchEventImpl(Unknown Source)
    at java.desktop/java.awt.EventQueue$4.run(Unknown Source)
    at java.desktop/java.awt.EventQueue$4.run(Unknown Source)
    at java.base/java.security.AccessController.doPrivileged(Native Method)
    at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
    at java.desktop/java.awt.EventQueue.dispatchEvent(Unknown Source)
    at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:729)
    at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:678)
    at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:373)
    at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
    at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
    at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
    at java.desktop/java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.desktop/java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.desktop/java.awt.EventDispatchThread.run(Unknown Source)
Caused by: io.ktor.client.call.ReceivePipelineException: Fail to run receive pipeline: com.fasterxml.jackson.module.kotlin.MissingKotlinParameterException: Instantiation of [simple type, class com.atlassian.bitbucket.cloud.rest.user.UserBean] value failed for JSON property username due to missing (therefore NULL) value for creator parameter username which is a non-nullable type
 at [Source: (String)"{"values": [{"description": "Added commits list to the initial page hydration.", "links": {"html": {"href": "https://staging.bb-inf.net/bitbucket/bitbucket/pull-requests/14436"}}, "title": "BBCDEV-7693: Hydration of commits list for Pull Requests", "reviewers": [{"display_name": "Peter Williams", "links": {"avatar": {"href": "https://avatar-cdn.atlassian.com/initials/PW?ordinal=6"}}}, {"display_name": "Sean Farley", "links": {"avatar": {"href": "https://avatar-cdn.stg.internal.atlassian.com/6553"[truncated 18618 chars]; line: 1, column: 386] (through reference chain: com.atlassian.bitbucket.cloud.rest.pagination.PagedBean["values"]->java.util.ArrayList[0]->com.atlassian.bitbucket.cloud.rest.pullrequest.PullRequestBean["reviewers"]->java.util.ArrayList[0]->com.atlassian.bitbucket.cloud.rest.user.UserBean["username"])
    at io.ktor.client.call.HttpClientCall.receive(HttpClientCall.kt:61)
    at io.ktor.client.call.HttpClientCall$receive$1.invokeSuspend(HttpClientCall.kt)
    ... 26 more
Caused by: com.fasterxml.jackson.module.kotlin.MissingKotlinParameterException: Instantiation of [simple type, class com.atlassian.bitbucket.cloud.rest.user.UserBean] value failed for JSON property username due to missing (therefore NULL) value for creator parameter username which is a non-nullable type
 at [Source: (String)"{"values": [{"description": "Added commits list to the initial page hydration.", "links": {"html": {"href": "https://staging.bb-inf.net/bitbucket/bitbucket/pull-requests/14436"}}, "title": "BBCDEV-7693: Hydration of commits list for Pull Requests", "reviewers": [{"display_name": "Peter Williams", "links": {"avatar": {"href": "https://avatar-cdn.atlassian.com/initials/PW?ordinal=6"}}}, {"display_name": "Sean Farley", "links": {"avatar": {"href": "https://avatar-cdn.stg.internal.atlassian.com/6553"[truncated 18618 chars]; line: 1, column: 386] (through reference chain: com.atlassian.bitbucket.cloud.rest.pagination.PagedBean["values"]->java.util.ArrayList[0]->com.atlassian.bitbucket.cloud.rest.pullrequest.PullRequestBean["reviewers"]->java.util.ArrayList[0]->com.atlassian.bitbucket.cloud.rest.user.UserBean["username"])
    at com.fasterxml.jackson.module.kotlin.KotlinValueInstantiator.createFromObjectWith(KotlinValueInstantiator.kt:53)
    at com.fasterxml.jackson.databind.deser.impl.PropertyBasedCreator.build(PropertyBasedCreator.java:189)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeUsingPropertyBased(BeanDeserializer.java:487)
    at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeFromObjectUsingNonDefault(BeanDeserializerBase.java:1265)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:325)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:159)
    at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:285)
    at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:244)
    at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:27)
    at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:519)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeWithErrorWrapping(BeanDeserializer.java:527)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeUsingPropertyBased(BeanDeserializer.java:416)
    at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeFromObjectUsingNonDefault(BeanDeserializerBase.java:1265)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:325)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:159)
    at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:285)
    at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:244)
    at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:27)
    at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:519)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeWithErrorWrapping(BeanDeserializer.java:527)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeUsingPropertyBased(BeanDeserializer.java:416)
    at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeFromObjectUsingNonDefault(BeanDeserializerBase.java:1265)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:325)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:159)
    at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4001)
    at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3030)
    at io.ktor.client.features.json.JacksonSerializer.read(JacksonSerializer.kt:16)
    at io.ktor.client.features.json.JacksonSerializer$read$1.invokeSuspend(JacksonSerializer.kt)
    at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:32)
    ... 21 more
2019-05-15 15:48:17,507 [67434517]  ERROR -            BitbucketReferences - PyCharm 2019.1.2  Build #PY-191.7141.48 
2019-05-15 15:48:17,507 [67434517]  ERROR -            BitbucketReferences - JDK: 11.0.2; VM: OpenJDK 64-Bit Server VM; Vendor: JetBrains s.r.o 
2019-05-15 15:48:17,507 [67434517]  ERROR -            BitbucketReferences - OS: Mac OS X 
2019-05-15 15:48:17,512 [67434522]  ERROR -            BitbucketReferences - Plugin to blame: Bitbucket Linky version: 7.0

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