Git commits in Moodle 3.0.8 by Tony Butler

commit 7d6c55bfc16002ec32693e2cd58746e796cc4e4c
Author: Tony Butler <tonyjbutler@gmail.com>
Date:   Sat, 29 Oct 2016 00:19:09 +0800
Tag:    v3.0.8

MDL-56948 mod_assign: Don't call get_grade_item() unless we have one