Add an empty choice to a required Django ChoiceField

fields.py

from django import forms
from django.core.exceptions import ValidationError

class EmptyChoiceField(forms.ChoiceField):

	def __init__(self, choices=(), empty_label=None, required=True, widget=None, label=None,
				 initial=None, help_text=None, *args, **kwargs):
		if required and empty_label is not None:
			choices = tuple([(0, empty_label)] + list(choices))
		super(EmptyChoiceField, self).__init__(choices=choices, required=required, widget=widget, label=label,
										initial=initial, help_text=help_text, *args, **kwargs)

	def validate(self, value):
		if value == "0":
			raise ValidationError(self.error_messages['required'])
		super(EmptyChoiceField, self).validate(value)