title: Deleting inline model in Django admin
body: <p>I am trying to use Django admin to remove an inline model. I get an error saying</p>
  
  <blockquote>
    <p>[u'Select a valid choice. That choice is not one of the available choices.']</p>
  </blockquote>
  
  <p>I check the location where the exception is raised. It seems like the inline model was removed, then a form validation happened on the parent model with the deleted inline model still as value of the form. That caused the failure.</p>
  
  <p>In my admin model, I had a <code>save_formset</code> method defined, that called <code>formset.save(commit=False)</code>. Is the <code>commit=False</code> not telling Django to not delete the related models?</p>
  
  <p>Thanks.</p>