[evince] Fix runtime critical warning when starting in fullscreen mode

[Carlos Garcia Campos <carlosgc src gnome org>]

commit 8875003da7f78a6fbba36fcc70d6ed2d372da7a6
Author: Carlos Garcia Campos <carlosgc gnome org>
Date:   Sun Oct 19 16:01:38 2014 +0200

    Fix runtime critical warning when starting in fullscreen mode
    
    The problem is that when running fullscreen mode we call
    ev_window_update_links_model() to update the page action widget of the
    fullscreen toolbar, but when running directly in fullscreen mode, this
    can happen before the links have been loaded in the sidebar. Since
    ev_window_update_links_model() is also called automatically when the
    links model property changes, we can simply return early in
    ev_window_update_links_model() when the model is NULL and it will be
    called again with a valid model when the links job finishes.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=737864

 shell/ev-window.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/shell/ev-window.c b/shell/ev-window.c
index 4de4732..e7f6a96 100644
--- a/shell/ev-window.c
+++ b/shell/ev-window.c
@@ -4024,6 +4024,9 @@ ev_window_update_links_model (EvWindow *window)
                      "model", &model,
                      NULL);
 
+       if (!model)
+               return;
+
        page_selector = ev_toolbar_get_page_selector (EV_TOOLBAR (window->priv->toolbar));
        ev_page_action_widget_update_links_model (EV_PAGE_ACTION_WIDGET (page_selector), model);
        if (window->priv->fs_toolbar) {