Git commits in Moodle 3.1.x by tunele

commit 705b215b6303e63d9ed9c4394426d6db5f6d7464
Author: tunele <antonello.moro1@gmail.com>
Date:   Fri, 01 Jul 2016 18:43:20 +0800
Tag:    v3.1.2

MDL-55083 admin: provide friendly error in case phpxml is missing