renderBuildTargetProblem: unexpected status

When running `cabal new-haddock` on [haddock (the project)](https://github.com/haskell/haddock) I hit this hole:

https://github.com/haskell/cabal/blob/738a51148217885f797ea56af773b945469286b9/cabal-install/Distribution/Client/CmdErrorMessages.hs#L325-L326

I'm using 738a51148217885f797ea56af773b945469286b9 of cabal (current `master`) and `e2cd0a80` of haddock (current position of `wip/new-ocean` which just modifies styling but is otherwise mostly up-to-date with `master`).

I hope this is error report is helpful. Otherwise I apologize.

Start by reproducing `cabal new-haddock` with the referenced Haddock revision and inspect `cabal-install/Distribution/Client/CmdErrorMessages.hs` around lines 325-326. Trace which status reaches `renderBuildTargetProblem` and determine the expected handling for that status. Done means the unexpected-status case is correctly handled and the reproduction no longer reaches the reported hole.

Written by the indexing model from the issue text.