Author: Damyon Wiese
MDL-52838 workshop: Each criterion > 0 levels
Add validation to the edit assessment form so each criterion in a rubric requires at least one level.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=2fa0109fbf29bca1c846fea3e01a49a068141658
http://github.com/moodle/moodle/commit/2fa0109fbf29bca1c846fea3e01a49a068141658
+ 3.3 en [mustdefinelevel,workshopform_rubric]