DOMKeyInfo.marshal should throw NPE when parent is null per KeyInfo.marshal API spec.


git-svn-id: https://svn.apache.org/repos/asf/santuario/xml-security-java/trunk@1485370 13f79535-47bb-0310-9956-ffa450edef68
applied SWA patch from https://issues.apache.org/jira/browse/WSS-430
JENTRATA - updated custom version
Merge branch 'swa-support' of github.com:jentrata/santuario-java into swa-support