Fixes build break - unit test expected non-existent dir to throw an exception

Review at http://gwt-code-reviews.appspot.com/1396802

Review by: pdr@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@9916 8db76d5a-ed1c-0410-87a9-c151d255dfc7
1 file changed