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<!-- Thank you for contributing to Ruff/ty! To help us out with reviewing, please consider the following: - Does this pull request include a summary of the change? (See below.) - Does this pull request include a descriptive title? (Please prefix with `[ty]` for ty pull requests.) - Does this pull request include references to any relevant issues? --> ## Summary <!-- What's the purpose of the change? What does it do, and why? --> This PR fixes #19047 / the [isinstance-type-none (FURB168)](https://docs.astral.sh/ruff/rules/isinstance-type-none/#isinstance-type-none-furb168) tuple false positive by adding a check if the tuple is empty to the code. I also noticed there was another false positive with the other tuple check in the same function, so I fixed it the same way. `Union[()]` is invalid at runtime with `TypeError: Cannot take a Union of no types.`, but it is accepted by `basedpyright` [playground](https://basedpyright.com/?pythonVersion=3.8&typeCheckingMode=all&code=GYJw9gtgBALgngBwJYDsDmUkQWEMoCqKSYKAsAFAgCmAbtQIYA2A%2BvAtQBREkoDanAJQBdQUA) and is equivalent to `Never`, so I fixed it anyways. I'm getting on a side tangent here, but it looks like MyPy doesn't accept it, and ty [playground](https://play.ty.dev/c2c468b6-38e4-4dd9-a9fa-0276e843e395) gives `@Todo`. ## Test Plan <!-- How was it tested? --> Added two test cases for the two false positives. [playground](https://play.ruff.rs/a53afc21-9a1d-4b9b-9346-abfbeabeb449) |
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