Fix issue that prevented poll submission on first creation in studio.
Fix issue that prevented poll submission on first creation in studio.

vasyarv/xblock-poll,open-craft/xblock-poll,mckinseyacademy/xblock-poll,msaqib52/xblock-poll,msaqib52/xblock-poll,vasyarv/xblock-poll,open-craft/xblock-poll,mckinseyacademy/xblock-poll,msaqib52/xblock-poll,open-craft/xblock-poll,vasyarv/xblock-poll,vasyarv/xblock-poll,mckinseyacademy/xblock-poll