Empty JSON fields in PR POST service

{"type"=>"pullrequest",
 "description"=>
  "* add missing test file\r\n\r\n* allow gearbox reference body to be specified separately for parent and child joints. add passthrough of springReference and springStiffness joint extensions.\r\n\r\n* fix branch name",
 "links"=>
  {"decline"=>{},
   "commits"=>{},
   "self"=>
    {"href"=>
      "https://api.bitbucket.org/2.0/repositories/_jrivero_/sdformat/pullrequests/3"},
   "comments"=>{},
   "merge"=>{},
   "html"=>
    {"href"=>"https://bitbucket.org/_jrivero_/sdformat/pull-requests/3"},
   "activity"=>{},
   "diff"=>{},
   "approve"=>{},
   "statuses"=>{}},
 "title"=>"Collision blobs spring gearbox",
 "close_source_branch"=>false,
 "reviewers"=>[],
 "destination"=>{},
 "comment_count"=>0,
 "id"=>3,
 "source"=>{},
 "state"=>"OPEN",
 "author"=>
  {"username"=>"_jrivero_",
   "type"=>"user",
   "display_name"=>"Jose Luis Rivero",
   "uuid"=>"{d12309b2-f745-42ee-b119-aec4fcdf81fe}",
   "links"=>
    {"self"=>{"href"=>"https://api.bitbucket.org/2.0/users/_jrivero_"},
     "html"=>{"href"=>"https://bitbucket.org/_jrivero_/"},
     "avatar"=>
      {"href"=>"https://bitbucket.org/account/_jrivero_/avatar/32/"}}},
 "created_on"=>"2016-10-27T16:50:04.117275+00:00",
 "participants"=>[],
 "reason"=>"",
 "updated_on"=>"2016-10-27T16:50:04.232387+00:00",
 "merge_commit"=>nil,
 "closed_by"=>nil,
 "task_count"=>0}