Fix a bug that caused a runtime error when attempting to read metadata of a class without metadata.

dart/tests/lib/mirrors/no_metadata_test.dart

Index: dart/tests/lib/mirrors/no_metadata_test.dart
diff --git a/dart/tests/standalone/http_launch_data/http_launch_main.dart b/dart/tests/lib/mirrors/no_metadata_test.dart
similarity index 68%
copy from dart/tests/standalone/http_launch_data/http_launch_main.dart
copy to dart/tests/lib/mirrors/no_metadata_test.dart
index bd35bae2c6bc033c1a4ba1e87ee6e428af4853d1..f5c0747a59928a9d4a8c29bc82bedf659940c368 100644
--- a/dart/tests/standalone/http_launch_data/http_launch_main.dart
+++ b/dart/tests/lib/mirrors/no_metadata_test.dart
@@ -2,12 +2,13 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+import 'dart:mirrors';
 
-library http_lanuch_main;
+import 'stringify.dart';
 
-import 'package:simple/simple.dart';
+class Foo {
+}
 
 main() {
-  print(getSimpleString());
+  expect('[]', reflectClass(Foo).metadata);
 }
-