[AMQP] Broker NPE when client attaches receiver to source that does not exist

java.lang.NullPointerException
	at org.proton.plug.context.AbstractConnectionContext$LocalListener.onFlow(AbstractConnectionContext.java:259)
	at org.proton.plug.handler.Events.dispatch(Events.java:85)
	at org.proton.plug.handler.impl.ProtonHandlerImpl.dispatch(ProtonHandlerImpl.java:362)
	at org.proton.plug.handler.impl.ProtonHandlerImpl.access$000(ProtonHandlerImpl.java:49)
	at org.proton.plug.handler.impl.ProtonHandlerImpl$1.run(ProtonHandlerImpl.java:63)
	at org.apache.activemq.artemis.utils.OrderedExecutorFactory$OrderedExecutor$ExecutorTask.run(OrderedExecutorFactory.java:100)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)

AMQP frames
◊  ◊◊ 5.968655  Frame 352  10.18.96.1:11335  -> 10.10.53.31:5672  ->   init AMQP (0): (1.0.0)
◊  ◊◊ 5.982233  Frame 353  10.18.96.1:11335  -> 10.10.53.31:5672  ->   open [0]
◊  ◊◊ 5.983141  Frame 354  10.18.96.1:11335  -> 10.10.53.31:5672  ->   begin [0,null]
◊  ◊◊ 5.988035  Frame 355  10.18.96.1:11335  -> 10.10.53.31:5672  ->   attach [0,0] receiver receiver-drain (source: amq.topicXXX, target: null)
◊  ◊◊ 5.991157  Frame 356  10.18.96.1:11335  -> 10.10.53.31:5672  ->   flow [0,0] (0,10)
◊  ◊◊ 6.036822  Frame 359  10.18.96.1:11335 <-  10.10.53.31:5672 <-    init AMQP (0): (1.0.0)
◊  ◊◊ 6.049694  Frame 362  10.18.96.1:11335 <-  10.10.53.31:5672 <-    open [0]
◊  ◊◊ 6.050310  Frame 364  10.18.96.1:11335 <-  10.10.53.31:5672 <-    begin [0,0]
◊  ◊◊ 6.054407  Frame 365  10.18.96.1:11335 <-  10.10.53.31:5672 <-    attach [0,0] sender receiver-drain (source: null, target: null), detach [0,0]
   ◊  attach [0,0] sender receiver-drain (source: null, target: null)
   ◊  detach [0,0]
        Length: 85
        Doff: 2
        Type: AMQP (0)
        Channel: 0
        Performative: detach (22)
        Arguments (list of 3 elements)
             Handle: 0 (67)
             Closed: true (65)
             Error (list of 2 elements)
                  Condition: amqp:internal-error
                  Description: AMQ219010: source address does not exist
◊  ◊◊ 6.072061  Frame 367  10.18.96.1:11335  -> 10.10.53.31:5672  ->   detach [0,0]
◊  ◊◊ 6.077239  Frame 368  10.18.96.1:11335  -> 10.10.53.31:5672  ->   end [0]
◊  ◊◊ 6.144358  Frame 372  10.18.96.1:11335 <-  10.10.53.31:5672 <-    end [0]
◊  ◊◊ 6.146988  Frame 373  10.18.96.1:11335  -> 10.10.53.31:5672  ->   close [0]
◊  ◊◊ 6.213966  Frame 374  10.18.96.1:11335 <-  10.10.53.31:5672 <-    close [0]