[AIRFLOW-5393] Fix 500 error from Ad Hoc Query when downloading CSV with no results (#6000)
[AIRFLOW-5393] Fix 500 error from Ad Hoc Query when downloading CSV with no results (#6000)


owlabs/incubator-airflow,owlabs/incubator-airflow,owlabs/incubator-airflow,owlabs/incubator-airflow