Implement worker thread as a daemon

cps/services/worker.py

@@ -59,7 +59,7 @@ class WorkerThread(threading.Thread):
         threading.Thread.__init__(self)
 
         self.dequeued = list()
-
+        self.daemon = True
         self.doLock = threading.Lock()
         self.queue = ImprovedQueue()
         self.num = 0
@@ -101,10 +101,9 @@ class WorkerThread(threading.Thread):
 
     # Main thread loop starting the different tasks
     def run(self):
-        main_thread = _get_main_thread()
-        while main_thread.is_alive():
         # this blocks until something is available
         item = self.queue.get()
+
         with self.doLock:
             # add to list so that in-progress tasks show up
             self.dequeued.append(item)