title: IntegrityError at /***/ (1048, "Column '***' cannot be null") in python django
body: <p>Hi I am getting this error because I have a field in my <a href="https://docs.djangoproject.com/en/1.4/topics/auth/#storing-additional-information-about-users" rel="nofollow">additional user info model</a> (<code>user = models.OneToOneField(User)</code>) that I am not filling in at sign up (as I want to let the user do it later). </p>
  
  <p>I wondered if there was any way to solve this problem other than allowing null field in the db?</p>
  
  <p>Cheers</p>