Git commits in Moodle 3.7.2 by Leon Stringer

commit c4e1a1518ca341ec979c50de2881bb714ff38bab
Author: Leon Stringer <leon@priorsvle.com>
Date:   Wed, 17 Jul 2019 00:25:23 +0800
Tag:    v3.7.2

MDL-59911 fileconverter_unoconv: Fix: test PDF fails after upgrade