[Master][Bug] takeMessage can't quit when pullRequest is Dropped

[qianlongzt]

consumeMessageOrderly

when no message in cache and pullRequest is droped，takeMessage can't quit

rocketmq-client-go/consumer/process_queue.go

Lines 265 to 268 in 378f68a

	func (pq *processQueue) takeMessages(number int) []*primitive.MessageExt {
	for pq.msgCache.Empty() {
	time.Sleep(10 * time.Millisecond)
	}

[stale]

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