Fix: potential panic in putMsgToCache (#2634)

When the upstream DNS server returns a message that contains no
questions (i.e. QDCOUNT == 0), `putMsgToCache` will trigger an
out-of-range panic.

Issue: #2524
Comment: https://github.com/Dreamacro/clash/issues/2524#issuecomment-1477477601

dns/resolver.go

@@ -162,7 +162,7 @@ func (r *Resolver) exchangeWithoutCache(ctx context.Context, m *D.Msg) (msg *D.M
 
 			msg := result.(*D.Msg)
 
-			putMsgToCache(r.lruCache, q.String(), msg)
+			putMsgToCache(r.lruCache, q.String(), q, msg)
 		}()
 
 		isIPReq := isIPRequest(q)