Actually, we want false to return a blank string. Make sure a numeric…

… zero would be passed for rendering.

src/TwbBundle/View/Helper/TwbBundleAlert.php

@@ -20,7 +20,7 @@ class TwbBundleAlert extends \Zend\Form\View\Helper\AbstractHelper{
 	 */
 	public function __invoke($sAlertMessage = null, $aAlertAttributes = null, $bDismissable = false){
 		if($sAlertMessage === null) return $this;
-		if($sAlertMessage == '') return '';
+		if($sAlertMessage === '' || $sAlertMessage === false) return '';
 		return $this->render($sAlertMessage,$aAlertAttributes,$bDismissable);
 	}