I'd like to be able to allow an empty scope, _but_ also restrict the scope to a specific list if a scope appears. I've configured my `.commitlintrc.yml` with the following: ```yaml scope: level: error options: - rp_sandbox_a - rp_sandbox_b - rp_sandbox_c # Scope may be empty scope-empty: level: ignore ``` … but a commit with no scope fails the `scope` rule.