invert Eternal::IsEmpty logic

include/v8.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 440 matching lines @@
 template <class T> class Eternal {
  public:
   V8_INLINE(Eternal()) : index_(kInitialValue) { }
   template<class S>
   V8_INLINE(Eternal(Isolate* isolate, Local<S> handle))
       : index_(kInitialValue) {
     Set(isolate, handle);
   }
   // Can only be safely called if already set.
   V8_INLINE(Local<T> Get(Isolate* isolate));
-  V8_INLINE(bool IsEmpty()) { return index_ != kInitialValue; }
+  V8_INLINE(bool IsEmpty()) { return index_ == kInitialValue; }
   template<class S>
   V8_INLINE(void Set(Isolate* isolate, Local<S> handle));
 
  private:
   static const int kInitialValue = -1;
   int index_;
 };
 
 
 /**
@@ skipping 6062 matching lines @@
  */
 
 
 }  // namespace v8
 
 
 #undef TYPE_CHECK
 
 
 #endif  // V8_H_