Fix typo
Fix race condition with loading next level
Return an empty object for next level instead of an error;
Supermodel has a race condition when some of the models fail to load,
when we override an error response as "success".
Fix next level spec
Remove comment per Scott's request
* Add script to merge existing course instances
* Have client only send one course instance creation
* Have server return existing course instance if one for the given classroom/course exists
* Remove bandaid code from ClassroomView
