Produces bad markup for pages that are not assigned to custom menu

Hi

First, Thanks for the widget.

On my site the widget does not seem to work properly when it is displayed on pages that have not been assigned to a custom menu. Specifically, ul and div tags are not closed. It produced the following code on a such a page:

<div id="in-this-section-7" class="widget in-this-section">
<h2 class="widgettitle">In This Section</h2>
<ul class="menu section-menu">
<div class="menu-main-nav-container">
<ul id="menu-main-nav-1" class="menu">
<li class="menu-item menu-item-type-post_type menu-item-object-page menu-item-has-children menu-item-198">
<a href="http://www.mysite.com/my-page/">My Page</a>
</ul>
</div>

http://wordpress.org/plugins/in-this-section/