avoid empty query

Author: mydea

packages/node/src/integrations/node-fetch/undici-instrumentation.ts

@@ -200,7 +200,7 @@ function onRequestCreated(config: UndiciInstrumentationConfig, { request }: Requ
     [ATTR_HTTP_REQUEST_METHOD_ORIGINAL]: request.method,
     [URL_FULL]: requestUrl.toString(),
     [URL_PATH]: requestUrl.pathname,
-    [URL_QUERY]: requestUrl.search,
+    [URL_QUERY]: requestUrl.search || undefined,
     [URL_SCHEME]: urlScheme,
     [SEMANTIC_ATTRIBUTE_SENTRY_ORIGIN]: 'auto.http.otel.node_fetch',
   };