Git commits in Moodle 3.2.4 by Henning Bostelmann

commit c6bbd48e231430172ab98c16f72e19450c1de28c
Author: Henning Bostelmann <henning.bostelmann@york.ac.uk>
Date:   Tue, 25 Apr 2017 18:57:19 +0800
Tag:    v3.2.4

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