Reviewed by Darin.

    Reviewed by Darin.

        Fixes <http://bugzilla.opendarwin.org/show_bug.cgi?id=10159>
        "REGRESSION: delegate returning no menu elements crashes webkit"

        No automated test, because there's no way to programmatically open a context menu,
        no manual test because there's no way to customize the context menu delegate.

        * WebView/WebView.m:
        (-[WebView _menuForElement:defaultItems:]): Make sure the context menu returned
        some menu items before accessing the first one.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@15726 268f45cc-cd09-0410-ab3c-d52691b4dbfc