Check if response is undefined for playlist model before parsing and Add remove student groups
Merge branch 'playlists' of github.com:aronasorman/ka-lite into playlists
clear each playlist's group list before rendering them again
rerender the playlist's groups if one of them got removed
always rerender the entire group list to avoid having double group
entries in a list when we drag the same group twice
used the saved variable title in the exam API endpoint
return the proper resource_uri for tests
allow trailing slash on the view test url
fix the setting of playlist entry titles and descriptions
Merge branch 'playlists' into nalanda-rct2