title: cannot remove installed apps from admin
body: <p>this is a followup question to <a href="https://stackoverflow.com/questions/2342031/remove-default-apps-from-django-admin">Remove default apps from Django-admin</a></p>
  
  <p>I am trying t remove Sites from my admin site and I call
  <code><pre>
  admin.site.unregister(Site)
  </pre></code>
  as was suggested.</p>
  
  <p>Iam getting an error saying that Site is not registered. Apparently my admin.py is called before the Site model is registered. Is there a cleaner way to accomplish what I need?</p>
  
  <p>thanks
  konstantin</p>