Git commits in Moodle 3.5.0 by Ann Adamcik

commit 4b4280f3e8c51d81ea0c165baeea596c25a89e5f
Author: Ann Adamcik <adamann2@isu.edu>
Date:   Sat, 02 Dec 2017 03:56:15 +0800
Tag:    v3.5.0-beta

MDL-58697: Only get group submission if enabled