fixed bug when no metadata in not ISM format

    else:

        num_obj = audio.fromtype(cfg.postprocessing["fmt"]).num_channels

        out_paths_splits = []

        if isinstance(audio.fromtype(cfg.postprocessing["fmt"]), audio.ObjectBasedAudio):

            out_meta_splits = []

        else:

            out_meta_splits = None

        item_names = [Path(i.name) for i in cfg.items_list]

        for out_dir in cfg.out_dirs:

            condition_list = []

            for item in item_names:

                condition_list.append(out_dir.joinpath(item))

            out_paths_splits.append(condition_list)

            a = metadata_search(out_dir, item_names, num_obj)

            out_meta_splits.append(a)

            if isinstance(audio.fromtype(cfg.postprocessing["fmt"]), audio.ObjectBasedAudio):

                out_meta_splits.append(metadata_search(out_dir, item_names, num_obj))

    scale_files(

        out_paths_splits,