Developer credits
Git commits in Moodle 3.5.3 by Dan Marsden
commit 4aa5cee144ceaebd0f7e024cddb7e85adfbc91a7 Author: Dan Marsden <dan@danmarsden.com> Date: Tue, 06 Nov 2018 04:57:36 +0800 Tag: v3.5.3 MDL-63800 mod_assign: don't show grade if not set.