Fix required GET param decorator handling.
Fix required GET param decorator handling.

mrpau/kolibri,indirectlylit/kolibri,indirectlylit/kolibri,learningequality/kolibri,mrpau/kolibri,mrpau/kolibri,lyw07/kolibri,DXCanas/kolibri,learningequality/kolibri,DXCanas/kolibri,mrpau/kolibri,learningequality/kolibri,lyw07/kolibri,indirectlylit/kolibri,learningequality/kolibri,lyw07/kolibri,DXCanas/kolibri,lyw07/kolibri,indirectlylit/kolibri,DXCanas/kolibri