Deluge crashes without username #2523

BUG: Unhandled error in plugin deluge: 'username'
Traceback (most recent call last):
  File "/home/paranoidi/apps/flexget/flexget/task.py", line 520, in __run_plugin
    result = method(*args, **kwargs)
  File "/home/paranoidi/apps/flexget/flexget/event.py", line 20, in __call__
    return self.func(*args, **kwargs)
  File "/home/paranoidi/apps/flexget/flexget/plugins/clients/deluge.py", line 22, in on_task_start
    self.setup_client(config)
  File "/home/paranoidi/apps/flexget/flexget/plugins/clients/deluge.py", line 51, in setup_client
    config['username'],
KeyError: 'username'