Git commits in Moodle 2.7.3 by Jon Marthaler

commit 4fab973d4bfc5a8d7bf19f1afcb4e0f924c5e694
Author: Jon Marthaler <jmarthaler@gmail.com>
Date:   Wed, 19 Mar 2014 03:12:35 +0800
Tag:    v2.7.3

MDL-38065 gradebook: Fix issue with hidden categories breaking rowspan.