Allow empty handles to escape handle scopes.

test/cctest/test-heap.cc

Index: test/cctest/test-heap.cc
diff --git a/test/cctest/test-heap.cc b/test/cctest/test-heap.cc
index 45c516038d5826bb05668ab7bb15b6c1ceceae12..5dc6ceb7ffdbc8ced081550139408d2ca8c9ff38 100644
--- a/test/cctest/test-heap.cc
+++ b/test/cctest/test-heap.cc
@@ -809,3 +809,19 @@ TEST(Iteration) {
   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());
+}