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=268acaeb93b581f4c1a49a800e4e519bf1d10013
http://github.com/moodle/moodle/commit/268acaeb93b581f4c1a49a800e4e519bf1d10013
+ 3.3 en [error_selectcmidpassfail,availability_completion]