Rust: Components field ignores intention of profile field

I've set the the `profile` option to minimal, as I only want cargo, rustc, and rust-std installed. I then have to set `components` to `"cargo,rustc,rust-std"`, as otherwise I still end up with `clippy`, `rust-fmt` and `rust-analyzer` installed. Setting `components` to `""` results in the same behavior, and setting it to `null` causes an error.

It would be nice to allow components to be either `""` or `null`, to signal that the `profile` is enough and I don't want any additional components installed.