function setArt(userConfig) {
    /*
      If the user defines default album art, this image will display if the active
      song doesn't have album art defined.
    */
    if (userConfig.default_album_art != undefined) {
      _config2.default.default_album_art = userConfig.default_album_art;
    } else {
      _config2.default.default_album_art = "";
    }

    /*
    If the user defines default playlist art, this image will display if the user
    tries to set up a playlist meta data image tag but doesn't have one defined.
    */
    if (userConfig.default_playlist_art != undefined) {
      _config2.default.default_playlist_art = userConfig.default_playlist_art;
    } else {
      _config2.default.default_playlist_art = "";
    }
  }
Sets the default_album_art and default_playlist_art from the
user supplied configuration.

@access public
@param {object} userConfig - A JSON object of user defined values that help configure and initialize AmplitudeJS.