Django breaks with PostgreSQL (psycopg2) and duplicate email/user

[leeezly]

This bug happens in model.py at:

  def add_email(self, user, email):
     try:
        email_address = self.create(user=user, email=email)

If this throws an IntegrityError (e.g. user and email already exist), Django fails when handling session and Cookies at the end with the HTTP return. This seems to be related to psycopg2, which cannot simply continue accessing the database when an IntegrityError was raised.