If it is something new, and they don't like it- cool, they can have something else.
If it is something I know they like and they are just being fussy/want something else. Tough. I will offer it again later.
It's not 'sending them to bed hungry'. It's encouraging positive healthy eating habits.
It's also not "nothing to eat", they'd have had breakfast, morning tea, lunch, afternoon tea, and snacks.
If my kids refuse dinner, it is because they are not hungry.