add missing property

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/validator/trunk@1452088 13f79535-47bb-0310-9956-ffa450edef68
ignore site-content

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/validator/trunk@1452089 13f79535-47bb-0310-9956-ffa450edef68