Null check for existing tag

Alok Joshirequested to merge
patch_npe_fix into master

Fixing a NPE scenario. Steps to reproduce:

  • Create a record with a null value for tags metadata field
  • Try to update the record metadata with PATCH api with add or replace operation, with tags

RecordUtilImpl.java will throw NPE at this line recordMetadata.getTags().putAll(newTags);, because recordMetadata.getTags() will return null

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