Merge commit 'origin/master~3' into benc-remove-channels

parsl/monitoring/radios.py

@@ -5,15 +5,11 @@
 import uuid
 from abc import ABCMeta, abstractmethod
 from multiprocessing.queues import Queue
-from typing import Optional
 
 import zmq
 
 from parsl.serialize import serialize
 
-_db_manager_excepts: Optional[Exception]
-
-
 logger = logging.getLogger(__name__)