Add a check to within to avoid panic on empty kdtree #12
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Hi!
Love the crate, its powering parts of my microscopy particle detection algorithm. I just ran into a rare bug in which the kdtree I was querying against was empty, which resulted in a panic on line 18 in within.rs. I've just manually added a check to my code to ensure I never query against an empty kd-tree, but I thought you might have some interest in avoiding this edge-case as well.
Thanks for the great work :)