Author: David Mudrak
MDL-30271 Inform the user about the example assessment conflict, instead of throwing the exception
http://git.moodle.org/gw?p=moodle.git;a=commit;h=103fc0ec44c62b48539f6c790e62bfcb63432d0c
http://github.com/moodle/moodle/commit/103fc0ec44c62b48539f6c790e62bfcb63432d0c
+ 2.0 en [assessmentreferenceconflict,mod_workshop]