def _format_left_fields(status_information):
    """Format the unformatted fields.

    :param status_information: The various fields information
    :type status_information: :class:`collections.defaultdict`
    :returns: The updated status informations
    :rtype: :class:`collections.defaultdict`
    """
    for key, value in status_information.copy().items():
        if isinstance(value, list) and value:
            status_information[key] = ' '.join(value)
        elif not value:
            status_information.pop(key, None)
    return status_information
