'Occult PI' bugfix

classes/login/ShibbolethLogin.php

@@ -22,10 +22,10 @@ class ShibbolethLogin extends LoginHandler {
 
             return $this->onIdentityDataReceived($eppn, function($identity) use($eppn) {
                         $identity->email = $_SERVER['mail'];
-                        if (isset($_SERVER['givenName'])) {
+                        if (isset($_SERVER['givenName']) && $_SERVER['givenName'] !== 'N/A') {
                             $identity->name = $_SERVER['givenName'];
                         }
-                        if (isset($_SERVER['sn'])) {
+                        if (isset($_SERVER['sn']) && $_SERVER['sn'] !== 'N/A') {
                             $identity->surname = $_SERVER['sn'];
                         }
                         $identity->eppn = $eppn;