iter::Fuse::empty()

It seems like it could be useful to create an empty method for core::iter::Fuse. It would create a Fuse iterator (of any type) that never yields a value. This would avoid having to use Option<Fuse<T>> instead.

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The current Fuse uses specialization to not do checking in the wrapper if the internal type is FusedIterator, so there would be some extra consequences from doing this.