[2.0.0-rc.2] Channel stuck, when publish to non existent exchange

[cosminardeleanu]

Related to https://github.com/cloudamqp/amqproxy/issues/151

Let's have 2 scripts (think about them as cronjobs), A and B:

• start script A, publish a message to exchange "X" (which exists)
  • job finishes, message received
  • channel 1 was used
• start script B, publish a message to exchange "Z" (which does not exists)
  • no error caught, script looks like it was successful
  • channel 1 was used
• from now on, when script A will start, it will act like everything is ok, but the message never arrives the exchange