Author: Inaki
auth/cas MDL-16168 CAS crashes if no LDAP is set up
Don't crash if no LDAP server is configured. This also means that
user details need to be retrieved/updated via other means.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=9a688af4ee06a6386a8f59ec8225b711b5c8caef
http://github.com/moodle/moodle/commit/9a688af4ee06a6386a8f59ec8225b711b5c8caef
+ 1.9 en [auth_ldap_host_url,core_auth]