Fixed an issue where Boxing a null object returned a boxed simple object, rather than a boxed null.
Fixed an issue where Boxing a null object returned a boxed simple object, rather than a boxed null.

fholm/IronJS,xamarin/IronJS,hnafar/IronJS,fholm/IronJS,xamarin/IronJS,hnafar/IronJS,fholm/IronJS,xamarin/IronJS,hnafar/IronJS,hnafar/IronJS,fholm/IronJS,hnafar/IronJS,xamarin/IronJS