[XML-SIG] DOM and empty namespaces

[Alexandre Fayolle]

OK, I've just commited the changes to 4DOM. 

 1. raise NamespaceErr when '' is used as a nsURI
 2. made non NS-aware methods delegate treatment to NS-aware methods when
available.

Do people want to see something similar to 1. in minidom?
I can do that while I'm busy with this stuff, though this could have an
impact on the main python distribution. 

Alexandre Fayolle
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