Fix 500 error on 404 page

uitwww/navbar.py

@@ -33,14 +33,15 @@ class Navbar:
 
     def current_navbars(self):
         """Get the list of current navbars"""
-        matcher = (flask.request.endpoint, tuple(flask.request.view_args.items()))
+        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)])
+            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])
+
+        return self._return_navbars([(0, -1)])
 
     def _return_navbars(self, navbars):
         """Return a list of navbars"""