Git commits in Moodle 3.3.0 by Gergely Kún

commit 2a00bd159d9eb199341f3fee3e057ea6d9fa4b66
Author: Gergely Kún <kun.gergely@kgservermanagement.com>
Date:   Thu, 16 Feb 2017 16:03:26 +0800
Tag:    v3.3.0-beta

MDL-56679 core: Initialise $SESSION if necessary