title: Django CMS malfunction: Site matching query does not exist
body: <p>I've installed all apps in a project, then added a site in the sites section, and deleted example.com. Now Pages section in Django CMS 2.0 isn't working: it raises a DoesNotExist exception: <code>Site matching query does not exist.</code> at <a href="http://127.0.0.1:8000/admin/cms/page/" rel="noreferrer">http://127.0.0.1:8000/admin/cms/page/</a></p>
  
  <p>The section worked normally before I deleted the example.com site.</p>
  
  <p>In settings.py I have <code>SITE_ID = 2</code> line. Still, in this call:</p>
  
  <pre><code>return Site.objects.get(pk=site_pk) 
  </code></pre>
  
  <p>in traceback, site_pk=1.</p>
  
  <p>How can I fix this?</p>