Allow url to be None aligned with tornado.options

rcthomas · rcthomas · commit a3dc47f1b455 · 2025-02-14T16:30:39.000-08:00
diff --git a/jupyterhub_idle_culler/__init__.py b/jupyterhub_idle_culler/__init__.py
@@ -643,6 +643,7 @@ def _log_format_default(self):
 
     url = Unicode(
         os.environ.get("JUPYTERHUB_API_URL"),
+        allow_none=True,
         help=dedent(
             """
             The JupyterHub API URL.
