Author: Ankit Kumar Agarwal
MDL-29619 Validate urls before generating output
http://git.moodle.org/gw?p=moodle.git;a=commit;h=b216ddbe68e44638bd5524283ac879c34f77ad5b
http://github.com/moodle/moodle/commit/b216ddbe68e44638bd5524283ac879c34f77ad5b
+ 2.0 en [invalidstoredurl,mod_url]