Git commits in Moodle 2.4.6 by Tony Levi

commit 954ba4bce4ad0e21e0219878f6bc17e64370cbb4
Author: Tony Levi <tony.levi@netspot.com.au>
Date:   Thu, 06 Jun 2013 12:41:19 +0800
Tag:    v2.4.6

MDL-40035: Avoid rebuild_course_cache always for empty course