Developer credits

Git commits in Moodle 2.5.4 by David Mudrák

commit 71adff6999051c60ea365cc51ed32b2abe4db5ea
Author: David Mudrák <david@moodle.com>
Date:   Tue, 27 Aug 2013 17:40:18 +0800
Tag:    v2.5.4

MDL-40191 MDLSITE-2455 Do not throw coding exception when the activity is not found