small fix in metadata concatenation

def fromarray(fmt: str, x: np.ndarray, fs: int) -> Audio:

    """Wrap the given array into an audio format"""

    if x is None or not fs:

        return ValueError("Both array and sampling rate must be specified!")

        raise ValueError("Both array and sampling rate must be specified!")

    output = _get_audio_class(fmt)(fmt)

    frame_length = int(IVAS_FRAME_LEN_MS * audio_objects[0].fs // 1000)

    # pad and concatenate

    concat_meta_all_obj = [None] * audio_objects[0].num_channels

    concat_meta_all_obj = [None] * len(meta_files[0])

    for audio_item in audio_objects:

        # check if audio is multiple of frame length