def questionize_label(word):
    """Convert a word to a true/false style question format.

    If a user follows the convention of using `is_something`, or
    `has_something`, for a boolean value, the *property* text will
    automatically be converted into a more human-readable
    format, e.g. 'Something?' for is_ and Has Something? for has_.

    Args:
        word (str): The string to format.

    Returns:
        word (str): The formatted word.
    """
    if word is None:
        return ''
    if word.startswith('is_'):
        return '{0}?'.format(word[3:])
    elif word.startswith('has_'):
        return '{0}?'.format(word[4:])
    return word