TypeError: strptime() argument 1 must be string, not None
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  File "flask/app.py", line 1598, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "flask_login/utils.py", line 261, in decorated_view
    return func(*args, **kwargs)
  File "service/auth.py", line 14, in func_wrapper
    return func(*args, **kwargs)
  File "routes/admin.py", line 129, in update_episode
    return admin_service.update_episode(episode_id, json.loads(request.get_data(True, as_text=True)))
  File "service/admin.py", line 436, in update_episode
    episode.airdate = datetime.strptime(episode_dict.get('airdate'), '%Y-%m-%d')

strptime() argument 1 must be string, not None