def replace_missing_csv(csv_list, missing_rep):
    """
    Replaces missing items in a CSV with a given missing representation string.
    """
    full_list = []
    for line in csv_list:
        line_list = line.split(',')
        new_line_list = []
        for item in line_list:
            if item == '':
                item = missing_rep
            new_line_list.append(item)
        full_list.append(new_line_list)
    return full_list
