ENH ignore error due to already cleaned up child process

Author: tomMoral

loky/backend/resource_tracker.py

@@ -171,6 +171,14 @@ def ensure_running(self):
                 else:
                     os.close(r)
 
+    def __del__(self):
+        # ignore error due to trying to clean up child process which has already been
+        # shutdown on windows See https://github.com/joblib/loky/pull/450
+        try:
+            super().__del__()
+        except ChildProcessError:
+            pass
+
 
 _resource_tracker = ResourceTracker()
 ensure_running = _resource_tracker.ensure_running