Fall back to using hub xsrf

src/noteburst/jupyterclient/jupyterlab.py

@@ -747,10 +747,13 @@ async def execute_notebook(
         """
         exec_url = self.url_for(f"user/{self.user.username}/rubin/execution")
         headers = {}
-        if self._lab_xsrf is None:
-            self.logger.warning("No XSRF token found for JupyterLab")
         if self._lab_xsrf:
             headers["X-XSRFToken"] = self._lab_xsrf
+        elif self._hub_xsrf:
+            self.logger.warning(
+                "No XSRF token found for JupyterLab, using hub token."
+            )
+            headers["X-XSRFToken"] = self._hub_xsrf
         try:
             # The timeout is designed to catch issues connecting to JupyterLab
             # but to wait as long as possible for the notebook itself