Fix sqlalchemy tests.
Fix sqlalchemy tests.

jonboiser/kolibri,DXCanas/kolibri,christianmemije/kolibri,DXCanas/kolibri,jonboiser/kolibri,DXCanas/kolibri,indirectlylit/kolibri,learningequality/kolibri,benjaoming/kolibri,benjaoming/kolibri,christianmemije/kolibri,mrpau/kolibri,lyw07/kolibri,christianmemije/kolibri,jonboiser/kolibri,indirectlylit/kolibri,lyw07/kolibri,indirectlylit/kolibri,indirectlylit/kolibri,mrpau/kolibri,lyw07/kolibri,learningequality/kolibri,benjaoming/kolibri,benjaoming/kolibri,jonboiser/kolibri,learningequality/kolibri,DXCanas/kolibri,mrpau/kolibri,mrpau/kolibri,lyw07/kolibri,learningequality/kolibri,christianmemije/kolibri