Get rid of panics in `commit_monitor`

[joepio]

Handler<CommitMessage> has a bunch of .unwrap()s because the handle function in actix does not return a Result.

I don't want to panic the server when anything here goes wrong (at least not in production). I'd rather log the error, and keep the thing going.

Maybe use catch_unwind? Edit: does not seem to work, I can't move the logic to a closure