Author: Ankit Agarwal
MDL-58196 availability: Fix UI for pass/fail config
For pass/fail setting to work properly, activities must have 'Require grade' completion set,
just make sure we don't allow activities without this setting to be set
http://git.moodle.org/gw?p=moodle.git;a=commit;h=49a84cec828c23a426a0d81b62c0ce93007bf123
http://github.com/moodle/moodle/commit/49a84cec828c23a426a0d81b62c0ce93007bf123
+ 3.4 en [error_selectcmidpassfail,availability_completion]