Allow empty handles to escape handle scopes.

test/cctest/test-heap.cc

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 
 #include <stdlib.h>
 
 #include "v8.h"
 
 #include "execution.h"
 #include "factory.h"
 #include "macro-assembler.h"
 #include "global-handles.h"
@@ skipping 791 matching lines @@
   objs[next_objs_index++] =
       Factory::NewStringFromAscii(CStrVector(str), TENURED);
   delete[] str;
 
   // Add a Map object to look for.
   objs[next_objs_index++] = Handle<Map>(HeapObject::cast(*objs[0])->map());
 
   CHECK_EQ(objs_count, next_objs_index);
   CHECK_EQ(objs_count, ObjectsFoundInHeap(objs, objs_count));
 }
+
+
+TEST(EmptyHandleEscapeFrom) {
+  InitializeVM();
+
+  v8::HandleScope scope;
+  Handle<JSObject> runaway;
+
+  {
+      v8::HandleScope nested;
+      Handle<JSObject> empty;
+      runaway = empty.EscapeFrom(&nested);
+  }
+
+  CHECK(runaway.is_null());
+}