Vue 3 RecycleScroller will crash if prerender value is larger than items length

I don't know if this is an issue or was this intended but I think it should check if there are enough items to prerended and if not, prerended a lower amount.

If I set the `prerender` value to be 5 and in my list, I get 3 items, I would get an error indicating, that ID field was not found on undefined item.