Git commits in Moodle 3.7.5 by Tim Schroeder

commit 21bac71befbbd1a985b465c58dd79230537dae6d
Author: Tim Schroeder <t.schroeder@itc.rwth-aachen.de>
Date:   Fri, 06 Dec 2019 18:42:19 +0800
Tag:    v3.7.5

MDL-67471 message: fixed mark_notification_read with messaging disabled


commit 6fd48eff303b1599c07b1735400fa25ad4b5fae7
Author: Tim Schroeder <t.schroeder@itc.rwth-aachen.de>
Date:   Wed, 16 Oct 2019 23:28:04 +0800
Tag:    v3.7.5

MDL-57755 message: fix notificaiton read status when messaging disabled