Fix race condition in Exercise Practice

Fixes #2213

Moves rendering of ExercisePractice and Playlist Views until after statusModel is loaded.

Prevents race conditions in rendering.

@aronasorman, @jamie and I debugged this today. Basically happens when page renders quicker than the status API call.
... so basically, you moved those deleted parts above into a "loaded" function, to make sure they're only run when the status model loads?