Show 404 errors "Sitemap file not found" in Download Logs

Hello,

currently when trying to download a wrong sitemap file, which is not really there shows an http 404 text "Sitemap file not found".

This access is logged in the "Show Sitemap Downloads Log", there's no info if this access succeeded or not.

So I suggest to show failed accesses in the Download Log.

Thanks,
Lian

Any feedback on this?

Would you consider this as a feature for 1.7.5 or 1.8?

Thanks,
Lian