$ret = GalleryEmbed::init(array('fullInit' => 'true'));
$albumIds = GalleryCoreApi::fetchAllItemIds('GalleryAlbumItem');
$albums = GalleryCoreApi::loadEntitiesById($albumIds[1]);
foreach ($albums as $album) {
  $album->setTheme(null);
}
$ret = GalleryEmbed::done();