Do not add ul for root dir

sitemap1.md

@@ -24,7 +24,7 @@ title: Site map
         {% endfor %}
         {% for dir in path %}
           {% unless dir == nil or dir == prev_path[forloop.index0] %}
-            {% assign levels_match = forloop.index0 %}
+            {% unless forloop.index0 == 0 %}{% assign levels_match = forloop.index0 %}{% endunless %}
             {% break %}
           {% endunless %}
         {% endfor %}