object detection: revise

opencv-yolo/web/web.py

@@ -368,6 +368,7 @@ def video_analysis(data):
         rabChanResult = connection.channel()
         rabChanResult.exchange_declare(exchange=AI_EXCHANGE, exchange_type="direct")
         rabChanResult.queue_declare(queue=AI_QUEUE_RESULT, durable=True)
+        if AI_EXCHANGE:
             rabChanResult.queue_bind(exchange=AI_EXCHANGE,
                     queue=AI_QUEUE_RESULT, routing_key=AI_QUEUE_RESULT)
         rabChanResult.basic_publish(exchange =AI_EXCHANGE,routing_key=AI_QUEUE_RESULT,body=json.dumps(ret),