Git commits in Moodle 2.8.3 by PJ King

commit 39afb9e4b32f42b3efa66189ffdb982872c713ab
Author: PJ King <pking@sebts.edu>
Date:   Wed, 17 Dec 2014 23:57:09 +0800
Tag:    v2.8.3

MDL-46671 availability: DEBUG when course_module does not exist.