stop_review job shouldn't fail if gunicorn isn't running
in #43 (closed) we fixed an issue with pipelines, but not before we had some broken review apps. we also had one in !28 (merged). when the app was redeployed, the old stop job was ran, only to fail because the PID file is missing.
maaaybe we should tweak that so that it doesn't fail when gunicorn is missing.
or we just ignore those issues for now and wait and see what @lavamind will come up with for deployments.