patch: make JS for-in loop work for null and undefined w/o throwing

[Harri Porten]

On Mon, 17 Nov 2003, Maciej Stachowiak wrote:

>
> In other browsers, doing a for-in loop on null or undefined does
> nothing, instead of throwing an exception, here's a patch that gives
> JavaScriptCore the same behavior:

Peter had already fixed this issue in March. Nevertheless, I added your
code comment for clarity.

Thanks,

Harri.