Fix 500 error on 404 page

uitwww/navbar.py

@@ -33,13 +33,14 @@ class Navbar:
 
     def current_navbars(self):
         """Get the list of current navbars"""
+        if flask.request.endpoint is not None:
             matcher = (flask.request.endpoint, tuple(flask.request.view_args.items()))
 
             if matcher in self.match:
                 return self._return_navbars(self.match[matcher])
             elif flask.request.endpoint in self.match:
                 return self._return_navbars(self.match[flask.request.endpoint])
-        else:
+
         return self._return_navbars([(0, -1)])
 
     def _return_navbars(self, navbars):