Git commits in Moodle 1.9.10 by Pierre Pichet

commit 2f31d181842f02d7c940a56ca8c32bc8bfe4a275
Author: Pierre Pichet <pichet.pierre@uqam.ca>
Date:   Fri, 17 Sep 2010 07:04:58 +0800
Tag:    v1.9.10

MDL-24241 replacing !empty() by isset()