Git commits in Moodle 3.4.0 by Henning Bostelmann

commit b2e76ba7d8420cdf0b790680690d647c6485694e
Author: Henning Bostelmann <henning.bostelmann@york.ac.uk>
Date:   Tue, 25 Apr 2017 18:57:19 +0800
Tag:    v3.4.0-beta

MDL-57957 mod_assign: show feedback file in absence of grade item