Temporary fix to handle null progress values
Temporary fix to handle null progress values

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