Author: Rossiani Wijaya
MDL-39488 Lesson Module: Fixed PHP error matching question, if one or more options have not been selected.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=a6b0fc1c93483070f8b62c53280ce2b4bda79e2b
http://github.com/moodle/moodle/commit/a6b0fc1c93483070f8b62c53280ce2b4bda79e2b
+ 2.4 en [noanswer,mod_lesson]