Check for empty handle in JSON stringifier

src/json-stringifier.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 583 matching lines @@
   current_part_ = handle_scope.CloseAndEscape(current_part_);
   return SUCCESS;
 }
 
 
 BasicJsonStringifier::Result BasicJsonStringifier::SerializeJSArraySlow(
     Handle<JSArray> object, int length) {
   for (int i = 0; i < length; i++) {
     if (i > 0) Append(',');
     Handle<Object> element = Object::GetElement(object, i);
+    RETURN_IF_EMPTY_HANDLE_VALUE(isolate_, element, EXCEPTION);
     if (element->IsUndefined()) {
       AppendAscii("null");
     } else {
       Result result = SerializeElement(object->GetIsolate(), element, i);
       if (result == SUCCESS) continue;
       if (result == UNCHANGED) {
         AppendAscii("null");
       } else {
         return result;
       }
@@ skipping 228 matching lines @@
       SerializeString_<false, uint8_t>(object);
     } else {
       SerializeString_<false, uc16>(object);
     }
   }
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_JSON_STRINGIFIER_H_