Author: Botond Hegedus
MDL-49198 core_webservice: Fix error when using existing service name
http://git.moodle.org/gw?p=moodle.git;a=commit;h=f8045246050b7748399a5e79eb9b85991808fb93
http://github.com/moodle/moodle/commit/f8045246050b7748399a5e79eb9b85991808fb93
+ 2.9 en [nameexists,core_webservice]