Using the tag BlogCategoryCount, we can determine if the blog is using categories or not. This allows me to put a Category Widget in a column, and auto-hide it if there are no categories created.
The default Page Listing Widget uses this logic. I do not know why the default Category Archives template does not. You can check out the code after the jump.
<mt:IfArchiveTypeEnabled archive_type="Category">
<mt:If tag="BlogCategoryCount">
<div class="widget-archive widget-archive-category widget">
<h3 class="widget-header">Categories</h3>
<div class="widget-content">
<mt:TopLevelCategories>
<mt:SubCatIsFirst>
<ul>
</mt:SubCatIsFirst>
<mt:If tag="CategoryCount">
<li><a href="<$mt:CategoryArchiveLink$>"<mt:If tag="CategoryDescription"> title="<$mt:CategoryDescription remove_html="1" encode_html="1"$>"</mt:If>><$mt:CategoryLabel$></a>
<mt:Else>
<li><$mt:CategoryLabel$>
</mt:If>
<$mt:SubCatsRecurse$>
</li>
<mt:SubCatIsLast>
</ul>
</mt:SubCatIsLast>
</mt:TopLevelCategories>
</div>
</div>
</mt:If>
</mt:IfArchiveTypeEnabled>
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