fixed notifcations nil bug
fixed notifcations nil bug

Summary: If you leave a group and then hit the back arrow and then try to turn off notifications you would run into nil and get a 404, not it's fixed

Test Plan: None

Projects: #ashby

Differential Revision: http://phab.calblueprint.org/D557

calblueprint/ashby-village,calblueprint/ashby-village,calblueprint/ashby-village