This adds functionality to check whether a job has files in GCS before dispatching to ETL parser.
This avoids launching a job that would otherwise result in BQ load failing.
Coverage increased (+0.2%) to 59.608% when pulling 4dc257b3f8d1c27f9902f745d56390a3e0015a76 on u-sandbox-check-empty into 480c30dc4ef4a736da553316b53ed1603024996c on master.
This adds functionality to check whether a job has files in GCS before dispatching to ETL parser. This avoids launching a job that would otherwise result in BQ load failing.
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