def get_empty_traits(user):
    """
    returns a list with trait-keywords of all the empty traits (score = 0)
    :param user: the user we want to check
    :return: a list of trait-names
    """
    empty_traits = []
    for trait, score in user.scores.items():
        if score == 0:
            empty_traits.append(trait)
    return empty_traits