[MDL-31143] If a question's average grade is 0, the quiz report displays an error. - Moodle Tracker

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Affected Branches:
MOODLE_21_STABLE, MOODLE_22_STABLE, MOODLE_23_STABLE
Fixed Branches:
MOODLE_21_STABLE, MOODLE_22_STABLE
Pull from Repository:
git://github.com/timhunt/moodle.git
Pull Master Branch:
~~MDL-31143~~
Pull Master Diff URL:
https://github.com/timhunt/moodle/compare/master...MDL-31143
Testing Instructions:

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1. Create a quiz with an essay question.

2. Make an attempt as a student.

3. As a teacher/admin, go to the quiz overview report, and make sure the average question grade is shown as '-'. and that there are no PHP errors, even with Developer debug.

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1. Create a quiz with an essay question. 2. Make an attempt as a student. 3. As a teacher/admin, go to the quiz overview report, and make sure the average question grade is shown as '-'. and that there are no PHP errors, even with Developer debug.

This is a minor regression caused by ~~MDL-30704~~

is a regression caused by

MDL-30704 Quiz grades report shows inconsistent averages

is duplicated by

MDL-31187 Warning when viewing quiz resuts.

Participants:: Aparup Banerjee, Eloy Lafuente (stronk7), Gerard Caulfield, Tim Hunt

Component watchers:: Tim Hunt, Andrew Lyons, Huong Nguyen, Jun Pataleta, Michael Hawkins, Shamim Rezaie, Simey Lameze, Stevani Andolo