[MDL-27040] get_users_by_capability generates u.id IN () when no users have accessallgroups - Moodle Tracker

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Testing Instructions:

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1. Create a course with some groups containing teachers and students
2. override the teacher permission, so they don't have accessallgroups
3. Create a quiz in separate groups mode, and attempt it as a teacher.
4. Try to view the quiz reports as a teacher.

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1. Create a course with some groups containing teachers and students 2. override the teacher permission, so they don't have accessallgroups 3. Create a quiz in separate groups mode, and attempt it as a teacher. 4. Try to view the quiz reports as a teacher.
Affected Branches:
MOODLE_20_STABLE, MOODLE_21_STABLE, MOODLE_22_STABLE
Fixed Branches:
MOODLE_20_STABLE, MOODLE_21_STABLE
Pull from Repository:
git://github.com/timhunt/moodle.git
Pull Master Branch:
~~MDL-27040~~
Pull Master Diff URL:
https://github.com/timhunt/moodle/compare/master...MDL-27040

It is possible to get the get_users_by_capability call in quiz_send_notification_emails to generate the SQL "OR u.id IN ()".

is duplicated by

MDL-27740 dmlreadexception error on close of quiz attempt