def get_divisive_norm(ind, divisive_norm_list):
    """
    Returns an element from a list of divisive norms if the list is not None.
    :param ind:                 index of the elements
    :param divisive_norm_list:  list of DivisiveNorm
    :return: DivisiveNorm or None (if divisive_norm_list == None)
    """
    if divisive_norm_list is None:
        return None
    return divisive_norm_list[ind]