Git commits in Moodle 2.6.2 by Ruslan Kabalin

commit 9d649ad7a3a0aee08d888d6e00f9dc5cb76cabd3
Author: Ruslan Kabalin <r.kabalin@lancaster.ac.uk>
Date:   Wed, 15 Jan 2014 00:12:00 +0800
Tag:    v2.6.2

MDL-43693: assignment: Fix JS error on grading page.