Fix bug in query_params_required decorator that prevented super calls.
Fix bug in query_params_required decorator that prevented super calls.

learningequality/kolibri,learningequality/kolibri,indirectlylit/kolibri,learningequality/kolibri,indirectlylit/kolibri,indirectlylit/kolibri,indirectlylit/kolibri,learningequality/kolibri