[MDL-28718] Block quiz results sometimes sometimes has no access to /mod/quiz/lib.php - Moodle Tracker

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Testing Instructions:

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This only happens when logged in as non-admin. AND it never happens on the first visit to the course page containing the block.
Logged in as student: go to the course -> no error. Do an activity, and return to the course-page -> get the above error.

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This only happens when logged in as non-admin. AND it never happens on the first visit to the course page containing the block. Logged in as student: go to the course -> no error. Do an activity, and return to the course-page -> get the above error.
Workaround:

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I suggest inserting
require_once $CFG->dirroot.'/mod/quiz/lib.php';
at line 2 of /blocks/quiz_results/block_quiz_results.php

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I suggest inserting require_once $CFG->dirroot.'/mod/quiz/lib.php'; at line 2 of /blocks/quiz_results/block_quiz_results.php
Affected Branches:
MOODLE_21_STABLE
Fixed Branches:
MOODLE_21_STABLE
Pull from Repository:
git://github.com/timhunt/moodle.git
Pull Master Branch:
~~MDL-28718~~
Pull Master Diff URL:
https://github.com/timhunt/moodle/compare/master...MDL-28718

Don't understand why but block quiz results sometimes causes a undefined function error:

Fatal error: Call to undefined function quiz_format_grade() in /var/www/moodletest/wwwroot/blocks/quiz_results/block_quiz_results.php on line 376