Author: Andrew Davis
MDL-46600 core_grades: made it explicit in the error message that a failed grade import means nothing was imported.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=23a62c47afbeef426048fab8159e1614187adfb8
http://github.com/moodle/moodle/commit/23a62c47afbeef426048fab8159e1614187adfb8
+ 2.8 en [importfailed,core_grades]