Author: Ryan Wyllie
MDL-67116 course: allow grading completion for non ratings grade item
http://git.moodle.org/gw?p=moodle.git;a=commit;h=a492f69caff061fb35416c11b19115370f973d29
http://github.com/moodle/moodle/commit/a492f69caff061fb35416c11b19115370f973d29
+ 3.8 en [badcompletionusegrade,core_completion]