Upgrading from Django 1.0 to 1.2, I'm suddenly getting errors when
creating objects in the admin form a class that essentially looks like
this:

class MyObject(models.Model):
  name = models.CharField(max_length=50)
  other_thing = models.ForeignKey(MyOtherModel, null=False,
blank=True)

  def save(self, *args, **kwargs):
    logging.debug('saving here')
    if not self.other_thing:
      other_thing = MyOtherModel()
      other_thing.save()
      self.other_thing = other_thing
   super(MyObject, self).save(*args, **kwargs)

Creating a MyObject in the admin and leaving the other_thing field
blank results in the following error:

Cannot assign None: "MyObject.other_thing" does not allow null values.

The logging statement is never being hit, so it looks like the over-
aggressive validation is being performed in the ModelForm.  What am I
doing wrong?

Thanks!

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