Batch ObjectMapper should not include null objects

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: Master
• Fix Version/s: 7.1.10 DXP FP22, 7.1.X, 7.2.10 DXP FP11, 7.2.10.3 DXP SP4, 7.2.X, 7.3.X, 7.3.10 DXP FP1, 7.3.10.1 DXP SP1, 7.3.6 CE GA7, Master
• Component/s: REST infrastructure (vulcan)
• Labels:
  • liferay-dxp-72-sp4
  • liferay-dxp-73-sp1
  • liferay-fixpack-dxp-1-7310
  • liferay-fixpack-dxp-11-7210
  • liferay-fixpack-dxp-22-7110
• Branch Version/s:
  7.3.x, 7.2.x, 7.1.x
• Backported to Branch:
  Committed
• Fix Priority: 2
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/98534

When exporting entities via batch null objects are exported too:

{
   "account":null,
... 

Expected behaviour:

Null objects are skipped just like headless queries, reducing the overall export size.