Separate bug on virgin grading policy edits not being persisted b/c the

definition not being updated when using defaults. Not sure why this
passed before.

cms/djangoapps/models/settings/course_grading.py

@@ -118,6 +118,8 @@ class CourseGradingModel(object):
             descriptor.raw_grader[index] = grader
         else:
             descriptor.raw_grader.append(grader)
+        # make definition notice the update
+        descriptor.raw_grader = descriptor.raw_grader
 
         get_modulestore(course_location).update_item(course_location, descriptor.definition['data'])