title: Empty label in widget Select
body: <p>Here in Forms we can use the <a href="https://docs.djangoproject.com/en/1.5/ref/forms/fields/#django.forms.ModelChoiceField.empty_label" rel="nofollow noreferrer">empty_label</a>. I use widget <a href="https://docs.djangoproject.com/en/1.5/ref/forms/widgets/#select" rel="nofollow noreferrer">Select</a>, my choices are from database, does it possible to use here <code>empty_label</code>? In model I have:</p>
  <pre><code>position = forms.IntegerField(label=position_label, required=False, 
      widget=forms.Select(choices=Position.objects.all().values_list('id', 'position'),
      attrs={'class':'main', 'title': position_label},
      ), empty_label=&quot;(Empty)&quot;)
  </code></pre>
  <p>But the error is:</p>
  <pre><code>TypeError: __init__() got an unexpected keyword argument 'empty_label'
  </code></pre>
  <p>How to set the label to 'Empty'?</p>