A cancelled build no longer reports itself as unverified

Builds here are cancelled routinely — a newer one supersedes the one waiting. The check that verifies a build against each live installation treated that as a failure, reporting that nothing had been verified and pointing readers at a step that had never run. True, but the wrong conclusion: a cancelled build produced nothing, so there was nothing to verify.

It now distinguishes the two. A cancelled build reports "no candidate" and passes. A build that succeeded but went unchecked still fails loudly — that one is a real gap, and it is the reason the check exists.