Git commits in Moodle 3.10.4 by ScottVerbeek

commit 4b9b0839b6f3fb23a35cc0fd4a0b84667ba83d75
Author: ScottVerbeek <scottverbeek@catalyst-au.net>
Date:   Fri, 19 Feb 2021 08:28:54 +0800
Tag:    v3.10.4

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