fix XMLWriter: write a DOM element with no local name

Author: lecousin

net.lecousin.core/src/main/java/net/lecousin/framework/xml/XMLWriter.java

@@ -276,6 +276,7 @@ public ISynchronizationPoint<IOException> addComment(CharSequence comment) {
 	/** Write the given DOM element. */
 	public ISynchronizationPoint<IOException> write(Element element) {
 		String name = element.getLocalName();
+		if (name == null) name = element.getNodeName();
 		String uri = element.getNamespaceURI();
 		String prefix = element.getPrefix();
 		Map<String, String> namespaces = null;