Git commits in Moodle 3.9.7 by ScottVerbeek

commit 91376cdb69c9af445378bd32d0dfcbf31ebda75a
Author: ScottVerbeek <scottverbeek@catalyst-au.net>
Date:   Fri, 19 Feb 2021 08:28:54 +0800
Tag:    v3.9.7

MDL-66673 groups: Stop notice when messaging system is disabled