Always ignore server heartbeat if client heartbeat is 0/None (change for issue #30)
Always ignore server heartbeat if client heartbeat is 0/None (change for issue #30)

smurfix/aio-py-amqp,dims/py-amqp,jonahbull/py-amqp,yetone/py-amqp,dims/py-amqp,dallasmarlow/py-amqp,yetone/py-amqp,smurfix/aio-py-amqp,jonahbull/py-amqp,dallasmarlow/py-amqp