A pull request's check without a previewed candidate says its composition was not judged, not its manifests (issue 1921, review note)

Claude-Session: https://claude.ai/code/session_01NcbgfFSnn24M3GcqttoU7i

modules/mesh-delivery-checker/internal/check/judge.go

@@ -251,8 +251,10 @@ type state struct {
 	// unpreviewed are the members (pullKey) with no preview of a merge: a head that does not merge, or a fetch that did not
 	// answer. The indexer holds no manifest of them, so the assigner's composition would only wait: it is not awaited.
 	unpreviewed []string
-	// noCandidate says why a whole try has no candidate of its group from the indexer, so its manifests were not judged and
-	// it was not composed; empty when it has one, and for a pull request's check.
+	// noCandidate says why the case has no previewed candidate of its heads from the indexer within the bound: for a whole
+	// try its manifests were not judged and it was not composed; for a pull request's check that began on the indexer's
+	// first write, its manifests were judged from that write and it was not composed. Empty when it has one, and for a pull
+	// request's check whose case already holds its fingerprints.
 	noCandidate string
 }
 
@@ -291,7 +293,11 @@ func (st *state) takeTryCandidate(ctx context.Context) {
 		return
 	}
 	no := func(why string) {
-		st.noCandidate = "the group's manifests and composition were not judged: " + why
+		what := "the group's manifests and composition were not judged: "
+		if st.c.Try == nil {
+			what = "the composition was not judged (the manifests were judged from the indexer's first write): "
+		}
+		st.noCandidate = what + why
 		st.c.note(st.noCandidate)
 	}
 	if st.j.Candidates == nil {