CompositeShapeRef::project_local_point panics when no match is found

[tbillington]

CompositeShapeRef::project_local_point panics when no match is found.

Original issue https://github.com/avianphysics/avian/issues/872.

Essentially best_val is never getting set to anything inside Bvh::find_best based on my step-through debugging.

https://github.com/dimforge/parry/blob/v0.25.1/src/partitioning/bvh/bvh_traverse.rs#L343