Why is the [revision list][1] for Super User question [225512][2] empty?

Platform: Firefox 3.6. Windows XP Professional 64-bit, SP 2.

  [1]: https://superuser.com/posts/225512/revisions
  [2]: https://superuser.com/questions/225512/is-there-a-firefox-esnetsion-to-capture-all-the-images-on-a-page-including-thos