Removing unused code

git-svn-id: https://svn.apache.org/repos/asf/santuario/xml-security-java/trunk@1589058 13f79535-47bb-0310-9956-ffa450edef68
[SANTUARIO-383] - NPE in DOMXMLSignature

git-svn-id: https://svn.apache.org/repos/asf/santuario/xml-security-java/trunk@1589059 13f79535-47bb-0310-9956-ffa450edef68