Fix: an exception when Client.stop_listening is called but the future is None #56
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This is a simple change, you can reproduce the issue by creatting a Client.register_next_step_handler and then calling the stop_listening method, this will find the listener but the future will be None as register_next_step_handler doesn't use future and it will rise this error:
'NoneType' object has no attribute 'done'