from typing import List


def goodrow(fields: List[bytes]) -> bool:
    """Finds obvious kinds of invalidity.

    Args:
        fields: parsed arduino line

    Returns:
        False if invalid, true otherwise
    """
    if fields is None:
        print('skip empty row')
        return False
    if len(fields) != 7:
        print(f'skip row len {len(fields)}')
        print(fields)
        return False
    return True