On deploy: a review requested of the review classifier on a PR whose repo
holds neither .hyperhive/review-classifier.yml nor .json on its default
branch now posts an APPROVED review at once, saying no review rules are
configured for the repo and it was approved without checks. No model call
is made. Before, that case posted a "No verdict" comment. A rules file that
exists but fails to load or parse still posts no verdict. The rule model is
unchanged and instance-wide: every repo without a rules file is approved.
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