[DOM] Fix getNamedItemNS() with empty URI not matching null namespace - #23498
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Normalize an empty URI to NULL in spec-following mode so xmlHasNsProp() matches null-namespace attributes, and skip XML_ATTRIBUTE_DECL results which cannot be wrapped as nodes. Closes phpGH-23498
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Dom\NamedNodeMap::getNamedItemNS() passed an empty-string URI straight to xmlHasNsProp(), which matches NULL-namespace attributes only when the URI pointer is NULL, so getNamedItemNS("", "bar") returned NULL even though hasAttributeNS("", "bar") found the attribute in spec-following mode. An empty URI now normalizes to NULL at the namednodemap entry point when a base object is present, the same conversion dom_get_attribute_ns() applies in element.c. A sibling audit of xmlHasNsProp() and xmlGetNsProp() call sites found no other path passing a user-supplied URI.