Current branch is incorrectly reported as "No" when running `git status` on an empty repo

[MaddyGuthridge]

To reproduce:

• git clone https://github.com/MadGutsBot/Empty.git (or any other empty repo)
• (await repo.status()).current gives the string "No"
• Contrastingly, (await repo.branchLocal()).current gives an empty string

I would expect these to give consistent results. In this case, given there are no branches, I'd expect the branch to be reported as null, although an empty string is manageable.