Allow a safe scroll pane to be constructed without its viewport view (which should be set later via setViewportView()).
Allow a safe scroll pane to be constructed without its viewport view
(which should be set later via setViewportView()).


git-svn-id: a1a4b28b82a3276cc491891159dd9963a0a72fae@1783 542714f4-19e9-0310-aa3c-eee0fc999fb1

threerings/narya,threerings/narya,threerings/narya,threerings/narya,threerings/narya