ZF-6996: fix parameter description hinting in Zend_Json_Server

git-svn-id: http://framework.zend.com/svn/framework/standard/trunk@20636 44c647ce-9c0f-0410-b52a-842ac1e357ba

library/Zend/Server/Reflection/Function/Abstract.php

@@ -237,7 +237,7 @@ abstract class Zend_Server_Reflection_Function_Abstract
             $return = new Zend_Server_Reflection_ReturnValue(array_shift($signature), $this->_returnDesc);
             $tmp    = array();
             foreach ($signature as $key => $type) {
-                $param = new Zend_Server_Reflection_Parameter($params[$key], $type, $this->_paramDesc[$key]);
+                $param = new Zend_Server_Reflection_Parameter($params[$key], $type, (isset($this->_paramDesc[$key]) ? $this->_paramDesc[$key] : null));
                 $param->setPosition($key);
                 $tmp[] = $param;
             }