TaskGroup: Use explicit None check for cancellation error (#114708)

diff --git a/Lib/asyncio/taskgroups.py b/Lib/asyncio/taskgroups.py
index e1c56d140bef7de4bf1d1685525850ee934bc73b..f322b1f6653f6a22518b4028e77e133fb72a2e4f 100644 (file)
--- a/Lib/asyncio/taskgroups.py
+++ b/Lib/asyncio/taskgroups.py
@@ -132,7 +132,7 @@ class TaskGroup:
 
         # Propagate CancelledError if there is one, except if there
         # are other errors -- those have priority.
-        if propagate_cancellation_error and not self._errors:
+        if propagate_cancellation_error is not None and not self._errors:
             raise propagate_cancellation_error
 
         if et is not None and not issubclass(et, exceptions.CancelledError):