§ 6. Void marriages. A marriage is absolutely void if contracted by a person whose husband or wife by a former marriage is living, unless either:

1. Such former marriage has been annulled or has been dissolved for a cause other than the adultery of such person; provided, that if such former marriage has been dissolved for the cause of the adultery of such person, he or she may marry again in the cases provided for in section eight of this chapter and such subsequent marriage shall be valid;

3. Such former marriage has been dissolved pursuant to section seven-a of this chapter.