Author: Andreas Grabs
MDL-25375 - mod/feedback/complete.php throws exception if email notifications are enabled
http://git.moodle.org/gw?p=moodle.git;a=commit;h=51c49cc056007f25d7b099fcf877ae940fbc5974
http://github.com/moodle/moodle/commit/51c49cc056007f25d7b099fcf877ae940fbc5974
+ 2.0 en [messageprovider:submission,mod_feedback]