null check uri before setting and getting metadata

null check uri before setting and getting metadata

2005-09-08  Marco Pesenti Gritti  <mpg@redhat.com>

        * shell/ev-window.c: (page_changed_cb),
        (setup_document_from_metadata), (update_sidebar_visibility),
        (setup_view_from_metadata), (ev_window_run_fullscreen),
        (ev_window_stop_fullscreen), (ev_window_run_presentation),
        (ev_window_stop_presentation), (ev_window_continuous_changed_cb),
        (ev_window_dual_mode_changed_cb),
        (ev_window_sidebar_current_page_changed_cb):

        null check uri before setting and getting metadata