Only find queue instance in the channel cache when queue.declare-ok i…

…s present (this is not the case when :nowait is used)

lib/amqp/channel.rb

@@ -828,10 +828,10 @@ def queue!(name, opts = {}, &block)
                 Queue.new(self, name, opts)
               else
                 shim = Proc.new { |q, method|
-          queue = find_queue(method.queue)
           if block.arity == 1
-            block.call(queue)
+            block.call(q)
           else
+            queue = find_queue(method.queue)
             block.call(queue, method.consumer_count, method.message_count)
           end
         }