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Author SHA1 Message Date
Brian Coca
ec8a556538
only add data when there is data to add (#54559)
Only add data when there is data to add

  also avoid clobbering existing data with empty file
  fixes #45843

* remove redundant code, update comments
* fix mock dataloader, original does not return None
* added test
2021-02-11 10:07:20 -05:00