[Plugin: Dropdown Menu Widget] NONE.css

Hi,

Dropdown Menu Widget adds some strange NONE.css to my page source. There is no such a file so I get 404 reports everytime someone visit my site and it drastically slows my page load. Could You tell me how can I get rid of it?

When changed to latest stable version nothing changed.

<!-- Dropdown Menu Widget Styles by shailan (http://shailan.com) v1.5.6beta on wp3.0.1 -->
<link rel="stylesheet" href="http://*********.com/wp-content/plugins/dropdown-menu-widget/shailan-dropdown.css" type="text/css" />
<link rel="stylesheet" href="http://*********.com/wp-content/plugins/dropdown-menu-widget/themes/NONE.css" type="text/css" />
<style type="text/css" media="all">
	ul.dropdown { white-space: nowrap;	}
</style>
<!-- /Dropdown Menu Widget Styles -->

Thanks in advice,
jukooz

EDIT: Adding blank NONE.css file resolved these isues.

http://ww.wp.xz.cn/extend/plugins/dropdown-menu-widget/