TIKA-1305: make RTF list handling slightly more robust against corrupt list metadata

git-svn-id: https://svn.apache.org/repos/asf/tika/trunk@1598693 13f79535-47bb-0310-9956-ffa450edef68
TIKA-1305: test file added to svn...argh.

git-svn-id: https://svn.apache.org/repos/asf/tika/trunk@1598698 13f79535-47bb-0310-9956-ffa450edef68