[XML-SIG] Pyexpat and namespaces

[Alexandre Fayolle]

When using pyexpat with feature_namespaces enabled, startElementNS is
called with qname set to None. This is documented as a possible behaviour
in the ContentHandler documentation. 

However, the instance of AttributesNSImpl passed as attrs parameter is
created with the qname argument set to an empty dictionnary. As a
consequence, calling getValueByQName, getNameByQName, getQNameByName,
getQNames will lead to an exception or an unexepected result. 

I think this should be noted somewhere in the standard library
documentation too. 

Opinions?

Alexandre Fayolle
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