'Uses _get_empty_context and adds the `render_model_icon` variable.'

def get_context(self, context, **kwargs):

    instance = kwargs.pop('instance')
    if (isinstance(instance, Model) and (not instance.pk)):
        instance.pk = 0
    kwargs.pop('varname')
    kwargs.pop('nodelist')
    extra_context = self._get_empty_context(context, instance, None, editmode=False, **kwargs)
    extra_context['render_model_add'] = True
    return extra_context
