Remove a model or a list of models from the list of models
        whose comments will be moderated.

        Raise ``NotModerated`` if any of the models are not currently
        registered for moderation.

def unregister(self, model_or_iterable):
        """
        Remove a model or a list of models from the list of models
        whose comments will be moderated.

        Raise ``NotModerated`` if any of the models are not currently
        registered for moderation.

        """
        if isinstance(model_or_iterable, ModelBase):
            model_or_iterable = [model_or_iterable]
        for model in model_or_iterable:
            if model not in self._registry:
                raise NotModerated("The model '%s' is not currently being moderated" % model._meta.module_name)
            del self._registry[model]