title: Python, Django and flatpage
body: <p>I'm trying to use Django and to add a flatpage.</p>
  
  <p>ValueError at /admin/flatpages/flatpage/add/</p>
  
  <p>Cannot use None as a query value</p>
  
  <pre><code>Request Method:     POST
  Request URL:    http://localhost:8000/admin/flatpages/flatpage/add/
  Django Version:     1.4.2
  Exception Type:     ValueError
  Exception Value:    
  </code></pre>
  
  <p>Cannot use None as a query value</p>
  
  <pre><code>Exception Location:     C:\Python27\lib\site-packages\django\db\models\sql\query.py in add_filter, line 1095
  Python Executable:  C:\Python27\python.exe
  Python Version:     2.7.3
  Python Path:    
  
  ['C:\\Users\\ivo\\Desktop\\eclipse-jee-indigo\\workspace\\blog',
   'C:\\Users\\ivo\\Desktop\\eclipse-jee-indigo\\workspace\\blog',
  ...
   'C:\\Python27\\lib\\site-packages\\Pythonwin']
  </code></pre>
  
  <p>How to get rid of it?</p>
  
  <p>Thank you</p>