Add minor ray tracing tests

[Vecvec]

Connections
fixes #6646

Description
adds tests the early returns by calling the functions with empty iterators.

Testing
This adds a new test that passes

Checklist

• Run cargo fmt.
• Run taplo format.
• Run cargo clippy. If applicable, add:
  • --target wasm32-unknown-unknown N/A
  • --target wasm32-unknown-emscripten N/A
• Run cargo xtask test to run tests.
• Add change to CHANGELOG.md. See simple instructions inside file.

[teoxoy]

Thanks!