- Fix usage of Platform.packageRoot.

pkg/analysis_server/test/integration/integration_tests.dart

Index: pkg/analysis_server/test/integration/integration_tests.dart
diff --git a/pkg/analysis_server/test/integration/integration_tests.dart b/pkg/analysis_server/test/integration/integration_tests.dart
index a83e7557e892d7674e4a5c9e5ad5044c341cc7bb..f05a7758d20a2516419376ec0f96f1d382e663fd 100644
--- a/pkg/analysis_server/test/integration/integration_tests.dart
+++ b/pkg/analysis_server/test/integration/integration_tests.dart
@@ -613,7 +613,7 @@ class Server {
       arguments.add('--observe');
       arguments.add('--pause-isolates-on-exit');
     }
-    if (Platform.packageRoot.isNotEmpty) {
+    if (Platform.packageRoot != null) {
       arguments.add('--package-root=${Platform.packageRoot}');
     }
     arguments.add('--checked');