Assign: missing notification on submission when it has been already notified about before

Hint: With the user that you grade, make their email something you can access then run cron when prompted to below to see the email come through and confirm it works. Test One: Create an assignment. Submit something as a student. Edit grade (marker, feedback, whatever) and set 'notify student: yes'. Run cron, php admin/cli/cron.php ( note: you may have to wait up to a minute before running this if you have run it recently) Ensure that notifications is sent. Edit the grade again and set 'notify student: yes' Run cron, php admin/cli/cron.php ( note: you may have to wait up to a minute before running this if you have run it recently) Ensure that notification is sent. Test Two: Use quick-grading from the assignment page to change a students grade. (ensure at the bottom, notify student is set to YES) Hit enter or the quick-save button. Run cron, php admin/cli/cron.php ( note: you may have to wait up to a minute before running this if you have run it recently) Should receive a email. Repeat the above but change notify student to NO. Should NOT receive any emails. Probably wise to grade the same assignment again but this time set 'notify student: no' and make sure it doesn't send too. Test Three: Run unit tests: mdk phpunit -u mod/assign/tests/locallib_test.php mdk phpunit -u mod/assign/tests/lib_test.php