Do not fail get_current_school on anonymous user.

biscuit/core/util/core_helpers.py

@@ -33,7 +33,7 @@ def get_current_school():
     request = get_request()
 
     if request:
-        if request.user.person:
+        if getattr(request.user, 'person', None):
             return request.user.person.school
         else:
             return None