[Bug] db_sync table sync incremental/full will fail when trying to copy over an empty table

[austinweisgrau]

The db_sync module does not handle well the scenario where the source table is empty, and in most cases will result in a confusing error being raised (destination table does not exist). This is due to trying to run a row count at the end of the sync. Even if running an incremental sync with verify_row_count explicitly set to false, if the source table is empty, the sync reverts to a full sync and does not pass along the verify_row_count flag.

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