As long as your car works, don't worry about it. Look at any fuse box and you'll probably find some missing. Manufacturer's don't make different boxes for different trim levels/options, but they aren't going to give you a fuse for a circuit you don't use.
For example - all candian cars have to have immobilizers, so there's probably an empty fuse where that would be, and where I have a fuse for the heated seats and mirrors, someone who lives in Florida and didn't order that would just have an empty spot.
The owners' manual should list most of them if you really want to know.