class RadioSelectNotNull(RadioSelect):

    def get_renderer(self, name, value, attrs=None, choices=()):
        """Returns an instance of the renderer."""
if value is None:
    value = ''
str_value = force_unicode(value)
final_attrs = self.build_attrs(attrs)
choices = list(chain(self.choices, choices))
if choices[0][0] == '':
    pass
How to get rid of the bogus choice generated by RadioSelect of Django Form