My Herbie has no front incisors. There are a lot of bunnies on here the same. Usually its due to them growing in misaligned.
Bunnies cope fine without them generally. The only thing I need to do differently is to cut up the veg into strips or bite sized chunks. Herbie copes fine with Muesli, Pellets, Hay without any changes.
One thing to note is that they do sometimes grow back in if the vet has not managed to kill all of the root, so let your friend know to keep a check on bunnies mouth.
Herbie got his removed at the rescue, they grew back in when I got him, I got them removed again and now two wee peg teeth grow back in. I am not putting him through the op again, so I get these two wee teeth burred every few months. He copes well with the burring and it is over in a jiffy!