Check the tables and emit a warning if missing.
Check the tables and emit a warning if missing.

mozilla-services/data-pipeline,sapohl/data-pipeline,mozilla-services/data-pipeline,whd/data-pipeline,whd/data-pipeline,acmiyaguchi/data-pipeline,whd/data-pipeline,acmiyaguchi/data-pipeline,mozilla-services/data-pipeline,sapohl/data-pipeline,sapohl/data-pipeline,mozilla-services/data-pipeline,sapohl/data-pipeline,acmiyaguchi/data-pipeline,acmiyaguchi/data-pipeline,whd/data-pipeline