Developer credits
Git commits in Moodle 1.9.11 by Sam Hemelryk
commit 2e490b8b29d8cec3bd0ab5d1ac7e9a7cb6aa8e56 Author: Sam Hemelryk <sam@moodle.com> Date: Mon, 13 Dec 2010 15:00:39 +0800 Tag: v1.9.11 mod-lesson MDL-22349 Fixed bug with matching lesson type and empty correct response. Kudos to Michael Lipp for the patch