in channel._on_close(), make sure connection is open before sending CloseOk
in channel._on_close(), make sure connection is open before
sending CloseOk

vrtsystems/pika,vitaly-krugl/pika,Zephor5/pika,zixiliuyue/pika,reddec/pika,skftn/pika,benjamin9999/pika,hugoxia/pika,Tarsbot/pika,renshawbay/pika-python3,fkarb/pika-python3,pika/pika,shinji-s/pika,knowsis/pika,jstnlef/pika