public function run()
 {
     $errorMessage = array(array("value" => "", "text" => Yii::t("openData", "Unknown Postal Code")));
     $cities = array();
     $postalCode = isset($_POST["postalCode"]) ? $_POST["postalCode"] : null;
     try {
         $cities = SIG::getCitiesByPostalCode($postalCode);
     } catch (CTKException $e) {
         $cities = array("unknownId" => array("name" => Yii::t("openData", "Unknown Postal Code"), "insee" => ""));
     }
     Rest::json($cities);
     Yii::app()->end();
 }