reorder the block finalization check

cmd/bootstrap/run/qc.go

@@ -167,11 +167,6 @@ func GenerateQCParticipantData(allNodes, internalNodes []bootstrap.NodeInfo, dkg
 		return nil, fmt.Errorf("need at least as many staking public keys as private keys (pub=%d, priv=%d)", len(allNodes), len(internalNodes))
 	}
 
-	// length of DKG participants needs to match stakingNodes, since we run DKG for external and internal validators
-	if len(allNodes) != len(dkgData.PrivKeyShares) {
-		return nil, fmt.Errorf("need exactly the same number of staking public keys as DKG private participants")
-	}
-
 	qcData := &ParticipantData{}
 
 	participantLookup := make(map[flow.Identifier]flow.DKGParticipant)
@@ -209,6 +204,13 @@ func GenerateQCParticipantData(allNodes, internalNodes []bootstrap.NodeInfo, dkg
 		})
 	}
 
+	// the above check could find out the missing nodes for dkg data
+	// length of DKG participants needs to match stakingNodes, since we run DKG for external and internal validators
+	if len(allNodes) != len(dkgData.PrivKeyShares) {
+		return nil, fmt.Errorf("(%v nodes != %v dkg key shares) need exactly the same number of staking public keys as DKG private participants",
+			len(allNodes), len(dkgData.PrivKeyShares))
+	}
+
 	qcData.Lookup = participantLookup
 	qcData.GroupKey = dkgData.PubGroupKey