Learn available consumers after switching current consumer

consumerlocator.py

@@ -33,9 +33,10 @@ class ConsumerLocator:
         """"
         Learns the list of consumers.
         """
-#TODO improve learning
-        recievedConsumerList = self.communicator.discoveravailableconsumers()
-        for consumer in recievedConsumerList:
+        recievedconsumerlist = self.communicator.discoveravailableconsumers()
+        if recievedconsumerlist is None:
+            return
+        for consumer in recievedconsumerlist:
             self.consumerList.append({"Host": consumer, "State": True, "LastOk": datetime.datetime.now()})
         self.updateConsumerList()
 
@@ -71,6 +72,7 @@ class ConsumerLocator:
                     break
 
             self.currentConsumer = newCurrentConsumer
+            self.learnconsumerlist()
 
         if self.currentConsumer is not None:
             return self.currentConsumer["Host"]