RTree panics when running locate_within_distance on an empty tree

[gold-silver-copper]

I am creating an application in which a loop runs. During this loop a new rtree is created, and potentially something is inserted, then I run locate_within_distance on the resulting tree. The issue is that if nothing gets inserted at all, the rtree remains empty, then running locate_within_distance() panics. Here is some code to reproduce the panic

fn main() {

    let mut empty_tree : RTree<[i64;3]> = RTree::new();

    let all = empty_tree.locate_within_distance([0,0,0], 10);
}

[gold-silver-copper]

just want to say thank you for fixing it !!!!!