ZF-10843 removing unnecessary call to _isValid in Zend_View_Helper_HeadScript

git-svn-id: http://framework.zend.com/svn/framework/standard/trunk@23548 44c647ce-9c0f-0410-b52a-842ac1e357ba

library/Zend/View/Helper/HeadScript.php

@@ -371,7 +371,6 @@ class Zend_View_Helper_HeadScript extends Zend_View_Helper_Placeholder_Container
             throw $e;
         }
 
-        $this->_isValid($value);
         return $this->getContainer()->offsetSet($index, $value);
     }