Git commits in Moodle 2.3.9 by Tony Levi

commit 94e36bc01fc31f389620079840270c2325638309
Author: Tony Levi <tony.levi@netspot.com.au>
Date:   Thu, 06 Jun 2013 12:41:19 +0800
Tag:    v2.3.9

MDL-40035: Avoid rebuild_course_cache always for empty course