Author: Conn Warwicker
MDL-83784 mod_quiz: Fix quiz unusable if question category missing.
Random questions set to question categories which no longer exist
was throwing an error making it impossible to use or edit the quiz
to fix it. This will now allow the user to view the questions and
edit the quiz in order to fix the problem of the missing category.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=17c3e8ecc80630f666b697bf6cf80395770add17
http://github.com/moodle/moodle/commit/17c3e8ecc80630f666b697bf6cf80395770add17
+ 4.4 en [missingcategory,mod_quiz]