bug fix in removeDuplicateOpinions: opinion being edited can be deleted when child_nos are migrated, so the opinion_no that deleted it needs to be returned
bug fix in removeDuplicateOpinions: opinion being edited can be deleted when child_nos are migrated, so the opinion_no that deleted it needs to be returned

paleobiodb/pbdb-new,paleobiodb/pbdb-new,paleobiodb/pbdb-new,paleobiodb/pbdb-new,paleobiodb/pbdb-new