I don't think there's a magical age that suits all babies to sleep through without feeding. It does probably irk me a little when people say 'babies over 6 months don't need to be fed at night' because I can tell you I know, for an undeniable fact my 6 month old was hungry at night, not waking habitually, but hungry. *Some* babies, even maybe *most* babies don't need to be fed through the night - I don't know, I'm not in the homes of most or some babies - but I was with my son and I do know he was hungry.
And it did stress other people way more than it stressed me that he was feeding at night. Everyone else seemed more distressed about him not 'sleeping through the night' than me. And in my down moments it made me feel like a crap parent. But nobody else knew my baby when they made the statement 'babies don't need to be fed at night', it just made me feel like I was doing something wrong.
Kristenh&chloe. My advice is go with your first instinct telling you it's not good for bub's. If you feel at some later point that it is habitual not hungry maybe give it a go if it feels right? But nobody knows your baby like you do - so trust yourself.
(at about 8 months I had a crack at offering water after being told to several times by a friend who had a friend who it worked for and jasper would just scream if I tried to feed him water instead of breast feeding him)