Use more caching in multidomain module

src/pretix/control/middleware.py

@@ -33,7 +33,7 @@ class PermissionMiddleware(MiddlewareMixin):
         if not request.path.startswith(get_script_prefix() + 'control'):
             # This middleware should only touch the /control subpath
             return
-        if hasattr(request, 'domain'):
+        if hasattr(request, 'organizer'):
             # If the user is on a organizer's subdomain, he should be redirected to pretix
             return redirect(urljoin(settings.SITE_URL, request.get_full_path()))
         if url_name in self.EXCEPTIONS: