Honestly, it’s good to have an empty 7th house. Even, venus & jupiter is not so good in 7th house due to karka bhav nashaya. Still, a natural benefic planet will surely give its natural good effects as per its nature. Rest things depends upon the lordship of 7th house and its strength of your 7th house. If lords of 5th or 9th are in 7th house then it can give some beneficial effects after marriage. Still, in general its better to have an empty 7th house.