user_playlist_remove_specific_occurrences_of_tracks is expecting a
different tracklist object to the one that is documented, causing a
"'dict' object has no attribute 'split'" error. Update it to expect the
correct format.
Fix issue where the get_cached_token method returns None instead of the
cached token object, meaning that users have to login again when the
initial token expires. The problem has two aspects:
- The first time the user calls get_cached_token after token
expiration, the token is refreshed but the "new_token_info" object is
not returned.
- The second time the user calls get_cached_token after token
expiration, the scope check fails, because the refresh_access_token
method didn't include the "scope" key when it cached the new
token_info results.