Allow empty handles to escape handle scopes.

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index d8e85b9acd17daa822510870ddb8a9e7bdd298b4..2100480e85864356f1f6c04cfaee13736eede544 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -537,10 +537,17 @@ i::Object** v8::HandleScope::RawClose(i::Object** value) {
   LOG_API("CloseHandleScope");
 
   // Read the result before popping the handle block.
-  i::Object* result = *value;
+  i::Object* result = NULL;
+  if (value != NULL) {
+    result = *value;
+  }
   is_closed_ = true;
   i::HandleScope::Leave(&previous_);
 
+  if (value == NULL) {
+    return NULL;
+  }
+
   // Allocate a new handle on the previous handle block.
   i::Handle<i::Object> handle(result);
   return handle.location();