class HomeView(FormMixin, TemplateView):
    template_name = 'home.html'
    form_class = LoginForm
    error_message = ""

    def dispatch(self, request, *args, **kwargs):
        if request.user.is_authenticated():
            redirect_to = settings.LOGIN_REDIRECT_URL
            return redirect(redirect_to)
        else:
            super(HomeView, self).dispatch(request, *args, **kwargs)

ValueError: The view home_app.views.HomeView didn't return an HttpResponse object. It returned None instead.