Git commits in Moodle 3.6.4 by Mihail Geshoski

commit 29924b65e306f20b3a2f3a6c1dda01d314cea38f
Author: Mihail Geshoski <mihail@moodle.com>
Date:   Tue, 07 May 2019 13:55:11 +0800
Tag:    v3.6.4

MDL-35396 lesson: Fix detailed statistics display for essay questions