def non_content_line(line):
    """
    Returns True iff <line> represents a non-content line of an Extended CSV
    file, i.e. a blank line or a comment.

    :param line: List of comma-separated components in an input line.
    :returns: `bool` of whether the line contains no data.
    """

    if len(line) == 0:
        return True
    elif len(line) == 1:
        first = line[0].strip()
        return len(first) == 0 or first.startswith('*')
    else:
        return line[0].strip().startswith('*')