AttributeError: 'str' object has no attribute 'get'

[sentry-io]

Sentry Issue: GPODDERNET-MC

AttributeError: 'str' object has no attribute 'get'
(7 additional frame(s) were not displayed)
...
  File "django/views/decorators/cache.py", line 44, in _wrapped_view_func
    response = view_func(request, *args, **kwargs)
  File "mygpo/decorators.py", line 77, in tmp
    return fn(request, *args, **kwargs)
  File "mygpo/decorators.py", line 113, in wrapper
    resp = f(*args, **kwargs)
  File "mygpo/api/advanced/__init__.py", line 107, in episodes
    update_urls = update_episodes(request.user, actions, now, ua_string)
  File "mygpo/api/advanced/__init__.py", line 239, in update_episodes
    podcast_url = action.get('podcast', '')