Docker transformation executor ends up with failure if there are no output tables

See log /admin/airflow/log?dag_id=40_Transformation_pydev&task_id=pydev&execution_date=2020-12-04T08%3A02%3A29.549689%2B00%3A00 in vm-ol-airflow.

When there are no output files from docker transformation, the transformation fails when trying to delete temporary files in output.