Handle nulls inside of content arrays

[Craig Lawrence]

e.g. {"type":"paragraph","content":[null,

• Old Error Messages: [ADF validation error: incoming adf does not comply with Atlassian Document Format])]]
• New Error Messages: [com.atlassian.adf.model.ex.AdfException$UnexpectedRuntimeException: Caught unexpected runtime exception: java.lang.NullPointerException (path: doc[0].paragraph[0])])]]

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There’s no valid reason for nulls here, so lets ignore them instead of throwing unexpected exceptions.

[Craig Lawrence]

Actually on second thought I think this is fine, and messing around with null handling isn’t worth it.
Also, the path to the bad object is clearly provided (path: doc[0].paragraph[0]) so there won’t be much confusion here.