Git commits in Moodle 2.6.3 by Jonathon Fowler

commit 911d3e9f0b2883e108e2e34092c4c16a66ab5741
Author: Jonathon Fowler <fowlerj@usq.edu.au>
Date:   Tue, 15 Apr 2014 12:18:55 +0800
Tag:    v2.6.3

MDL-44270 files: handle drag-drop js error when event has null types