[XML-SIG] problem with empty namespace uri

[Martin v. Loewis]

> So to sum things up, this means that:
> 
>  * the patch to drv_xmlproc should be correct. I believe drv_expat should 
> be already fine;
>  * 4DOM/minidom/etc. should be updated to use None for the namespace uri;
>  * applications using these implementation should be updated. 

Right.

Martin