Author: Inaki
auth/cas: MDL-25062 CAS authentication plugin does not validate the CAS server certificate
If we enable the server validation but don't specify a certificate file path
flag the error and don't let the user save the settings.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=d485928c12f6ebfa3d216b6e52918ade24b54bb8
http://github.com/moodle/moodle/commit/d485928c12f6ebfa3d216b6e52918ade24b54bb8
+  1.8 en [auth_cas_certificate_path_empty,core_auth]
                        
    
    
    
                            
    
    
                                [AMOS commit] auth/cas: MDL-25062 CAS authentication plugin does not validate the CAS server certificate
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