Author: Marina Glancy
MDL-50586 gradingform_rubric: warn about missing 0-points levels
http://git.moodle.org/gw?p=moodle.git;a=commit;h=3d91ad994660e7492b63775d2a160a40acf6cfc7
http://github.com/moodle/moodle/commit/3d91ad994660e7492b63775d2a160a40acf6cfc7
+ 3.2 en [err_novariations,gradingform_rubric]
+ 3.2 en [zerolevelsabsent,gradingform_rubric]