`tidy` reports `missing <li>` multiple times in most files in the generated API documentation.

This appears to be caused by a systemic error when generating the "breadcrumbs" in the nav bar at the top of each file.

Here's a random example:

<ol class="sub-nav-list">
<li><a href="../../module-summary.html">java.compiler</a></li>
&nbsp;&gt;&nbsp;
<li><a href="package-summary.html">javax.tools</a></li>
&nbsp;&gt;&nbsp;
<li><a href="JavaFileManager.Location.html" class="current-selection">JavaFileManager.Location</a></li>
</ol>

Notice the characters &nbsp;&gt;&nbsp; appearing between the list items.