Fixed Unknown state on disconnect error message generated when closing  connections.
Fixed Unknown state on disconnect error message generated when closing  connections.

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