Git commits in Moodle 3.7.2 by Nicolas Dunand

commit 5cad3e5d465088cc50ac904598c066502848402f
Author: Nicolas Dunand <nico@kolya.ch>
Date:   Wed, 26 Sep 2018 14:50:10 +0800
Tag:    v3.7.2

MDL-63458 core_user: Remove send message if messaging is disabled