Fix check for return of error before calling SyncDirectoryListing.

runtime/bin/directory.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // 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.
 
 #include "bin/directory.h"
 
 #include "bin/dartutils.h"
 #include "include/dart_api.h"
 #include "platform/assert.h"
 
@@ skipping 125 matching lines @@
   // Create the list to hold the directory listing here, and pass it to the
   // SyncDirectoryListing object, which adds elements to it.
   Dart_Handle follow_links = Dart_GetNativeArgument(args, 2);
   // Create the list to hold the directory listing here, and pass it to the
   // SyncDirectoryListing object, which adds elements to it.
   Dart_Handle results =
       Dart_New(DartUtils::GetDartType(DartUtils::kCoreLibURL, "List"),
                Dart_Null(),
                0,
                NULL);
+  if (Dart_IsError(results)) Dart_PropagateError(results);
   SyncDirectoryListing sync_listing(results,
                                     DartUtils::GetStringValue(path),
                                     DartUtils::GetBooleanValue(recursive),
                                     DartUtils::GetBooleanValue(follow_links));
   Directory::List(&sync_listing);
   Dart_SetReturnValue(args, results);
 }
 
 
 CObject* Directory::CreateRequest(const CObjectArray& request) {
@@ skipping 264 matching lines @@
   if (listing->error()) {
     listing->HandleError("Invalid path");
     listing->HandleDone();
   } else {
     while (ListNext(listing)) {}
   }
 }
 
 }  // namespace bin
 }  // namespace dart