Added a guard against IndexOutOfBoundsException

Review at http://gwt-code-reviews.appspot.com/613802

Review by: jlabanca@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@8302 8db76d5a-ed1c-0410-87a9-c151d255dfc7
1 file changed