def get_family_notes(family, data_dir=None):
    '''Return a string representing the notes about a basis set family

    If the notes are not found, an empty string is returned
    '''

    file_path = _family_notes_path(family, data_dir)
    notes_str = fileio.read_notes_file(file_path)

    if notes_str is None:
        notes_str = ""

    ref_data = get_reference_data(data_dir)
    return notes.process_notes(notes_str, ref_data)
Return a string representing the notes about a basis set family

    If the notes are not found, an empty string is returned