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=51fce0f6e0b158d122b13710ed0e981db9045be4
http://github.com/moodle/moodle/commit/51fce0f6e0b158d122b13710ed0e981db9045be4
+ 2.5 en [noanswer,mod_lesson]