Not possible to skip the empty feature set (?)

[JSorngard]

Thank you so much for the extremely useful project!

I have a project that has two features where at least one of them must be enabled. I would therefore like to skip the empty feature set when running cargo-all-features.

I would expect the Cargo.toml option

[package.metadata.cargo-all-features]
skip_feature_sets = [
    [],
]

to skip the empty feature set, but instead it skips all feature sets and makes cargo-all-features do nothing.
Would this be possible to change? Alternatively this is already supported and I am just missing something obvious. In that case I apologize, but would still love to hear how I might accomplish this!