allow empty event bus

jupyter-server · May 11, 2022 · 1d95635 · 1d95635
1 parent 3fe3480
commit 1d95635
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/jupyter_server/serverapp.py b/jupyter_server/serverapp.py
@@ -1571,6 +1571,7 @@ def _default_kernel_spec_manager_class(self):
 
     event_bus = Instance(
         EventBus,
+        allow_none=True,
         help="An EventBus for emitting structured event data from Jupyter Server and extensions.",
     )