The `BKE_bvhtree_from_pointcloud_get` function have requirements for input point cloud argument and initialization of `BVHTreeFromPointCloud` can be skipped. Due to `BVHTreeFromPointCloud` is not initialized by default constructor, it can contains garbage data. To check if tree is initialized field of `BVHTreeFromPointCloud`, return argument shouldn't be ignored. `[[nodiscard]]` attributes is added. Pull Request: https://projects.blender.org/blender/blender/pulls/109892