Crimson: a bug in ElementNode2

[Tom M. Yeh]

At line 433 in org.apache.crimson.tree.ElementNode2.getAttributeNodeNS

        && (attr.getNamespaceURI() == namespaceURI...

shall add a test of whether attr.getNamespaceURI is null. Otherwise, the following 
statement will cause a NullPointerException -- while it shall return false.

        element.hasAttributeNS("a-uri", "a-attribute-without-namespace");

Regards,
Tom Yeh