Git commits in Moodle 2.1.x by Eduardo Pinto

commit 234f870c888a3889d2126b192d4f6c120208c0b0
Author: Eduardo Pinto <efgpinto@gmail.com>
Date:   Thu, 23 Feb 2012 13:38:54 +0800
Tag:    v2.1.5

MDL-26496 Lesson Module: removed warning when no answer is selected from single choice question