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=ce225e1c5e043ddd27b2864b231c62de8467bee3
http://github.com/moodle/moodle/commit/ce225e1c5e043ddd27b2864b231c62de8467bee3
+ 3.4 en [mustdefinelevel,workshopform_rubric]