Correct UpdateEvent.hasFields
The fetch phase can fail due to the transcoder output including a Row object that contains only null values. Update the relevant method to recognize that all values are null and we do not have any fields.
Bug: T347075
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The fetch phase can fail due to the transcoder output including a Row object that contains only null values. Update the relevant method to recognize that all values are null and we do not have any fields.
Bug: T347075