Invalid tag

edit

Looking at the tags page on this site, I see a funny looking one, something like:

[] x26

Looks like an empty tag.

Firebug shows this for the source:

<li>
  <div class="tag-left">
    <a class="tag tag-right" data-tag-name="" rel="tag" title="see questions tagged ''" href="/en/questions/scope:all/sort:activity-desc/tags:/page:1/"></a>
  </div>
  <span class="tag-number">× 26</span>
</li>

Compare that to another, proper tag:

<li>
  <div class="tag-left">
    <a class="tag tag-right" data-tag-name="0.7.40" rel="tag" title="see questions tagged '0.7.40'" href="/en/questions/scope:all/sort:activity-desc/tags:0.7.40/page:1/">0.7.40</a>
  </div>
  <span class="tag-number">× 26</span>
</li>

So yes, it's an empty tag. :)

Obviously, the page it links to gives an error.