Fallback to Python logger when djprogress' error logging mechanism fails

https://trac.vikingco.com/ticket/15680
Also fixes a typo that caused a crash. @janfabry, can you review this one since you submitted the task?
Context for code reviewers: [here](http://sentry.vikingco.com:64647/mobilevikings-be/mobilevikings/group/359101/) is the associated Sentry entry. It looked like a `Progress.DoesNotExist` error to me, but I could be wrong.