Adds get_queue_master_per_binding/3 handle all clause, to handle

exchange type bindings, for example.

References #521

Author: Ayanda-D

src/rabbit_queue_location_min_masters.erl

@@ -74,4 +74,6 @@ get_queue_master_per_binding(VHost, [#binding{destination=
                                [Master|QueueMastersAcc];
                            _ -> QueueMastersAcc
                        end,
-    get_queue_master_per_binding(VHost, RemBindings, QueueMastersAcc0).
+    get_queue_master_per_binding(VHost, RemBindings, QueueMastersAcc0);
+get_queue_master_per_binding(VHost, [_|RemBindings], QueueMastersAcc) ->
+    get_queue_master_per_binding(VHost, RemBindings, QueueMastersAcc).