handling errors in parameters when fed_id is given

lib/validatorClass.php

@@ -72,7 +72,12 @@ class Validator {
                     $this->params['federror'] = "No metadata URL registered in the eduGAIN database for federation ".$this->edugain->FEDS[$fed_id]['fed_id'].' - '.$this->edugain->FEDS[$fed_id]['name'];
                 } else {
                    $this->params['fedname'] = $this->edugain->FEDS[$fed_id]['name'];
+		   if (isset($this->edugain->FEDS[$fed_id]['reg_auth'])) {
                        $this->params['regauth'] = $this->edugain->FEDS[$fed_id]['reg_auth'];
+		   } else {
+                       $this->params['regauth'] = '';
+	           }
+		   if (isset($this->edugain->FEDS[$fed_id]['certificate'])) {
                      for ($n=0; $n<count($this->edugain->FEDS[$fed_id]['certificate']); $n++) {
                        $certificate = $this->edugain->FEDS[$fed_id]['certificate'][$n]['data'];
                        $certificate = trim($certificate, "\n");
@@ -97,6 +102,7 @@ class Validator {
                      fputs($ff, json_encode($this->edugain->FEDS[$fed_id]['certificate']));
 		   }
                }    
+           }
            $this->params['auto'] = $this->params['validate'] = $this->params['edugain'] = 1;
            if (isset($_REQUEST['xmlout']) || (!empty($_REQUEST['format']) && $_REQUEST['format'] == 'xml') )
                $this->params['xmlout'] = 1;