Git commits in Moodle 2.8.9 by Jinu Abraham

commit 200522e7c61af98622d857552a359e47989c677d
Author: Jinu Abraham <jinu.abraham@blackboard.com>
Date:   Mon, 31 Aug 2015 13:18:31 +0800
Tag:    v2.8.9

MDL-50483 gradereport_user: fix the fatal error of no enrolled users

commit 12259f01ce459584b9a26c44e14a1201782c1fb9
Author: Jinu Abraham <jinu.abraham@blackboard.com>
Date:   Mon, 31 Aug 2015 10:34:01 +0800
Tag:    v2.8.9

MDL-51232 mod_book: Filter name header