function initializePlaylistShuffleLists() {
    /*
    Iterate over all of the playlists the user defined adding
    the playlist key to the shuffled playlists array and creating
    and empty object to house the shuffled playlists
    */
    for (var key in _config2.default.playlists) {
      _config2.default.playlists[key].shuffle_list = [];
    }
  }
Initializes the shuffled playlist placeholders. These will be set for
playlists that are shuffled and contain the shuffled songs.

@access private