Alexa Guard: TypeError: 'NoneType' object is not subscriptable` in state_json refresh

[alandtse]

Just a heads up, I'm not in Germany and I too am seeing this (I am in the U.S.).

Sun Jul 07 2019 07:14:24 GMT-0700 (Pacific Daylight Time)
Error doing job: Future exception was never retrieved
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/concurrent/futures/thread.py", line 57, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/config/custom_components/alexa_media/alarm_control_panel.py", line 95, in _handle_event
    self.refresh()
  File "/usr/src/homeassistant/homeassistant/util/__init__.py", line 224, in wrapper
    result = method(*args, **kwargs)
  File "/usr/src/homeassistant/homeassistant/util/__init__.py", line 224, in wrapper
    result = method(*args, **kwargs)
  File "/config/custom_components/alexa_media/alarm_control_panel.py", line 106, in refresh
    if state_json['deviceStates']:
TypeError: 'NoneType' object is not subscriptable

Originally posted by @monsieurlatte in https://github.com/keatontaylor/alexa_media_player/issues/243#issuecomment-509003674