Author: Paul Holden
MDL-74282 grade: omit outcomes report if outcomes aren't enabled.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=9cde5a75bba0315dbd8c37b66eed158f44ceac32
http://github.com/moodle/moodle/commit/9cde5a75bba0315dbd8c37b66eed158f44ceac32
+ 3.11 en [outcomesdisabled,core_grades]