Fix missing risk challenge response

server/db/mysql/tenant_adapter.go

@@ -5028,6 +5028,9 @@ func (a *adapter) riskChallengeByIDTx(ctx context.Context, q sqlx.QueryerContext
 		query += " FOR UPDATE"
 	}
 	if err := sqlx.GetContext(ctx, q, &row, query, challengeID); err != nil {
+		if err == sql.ErrNoRows {
+			return nil, t.ErrNotFound
+		}
 		return nil, err
 	}
 	challenge := &t.RiskChallenge{