[goffice] Don't crash while selecting the 3d box.

[Jean Bréfort <jbrefort src gnome org>]

commit 715acd4ec357ea68fe5352eeae5a501a4d0ef28b
Author: Jean Brefort <jean brefort normalesup org>
Date:   Sat May 10 11:37:34 2014 +0200

    Don't crash while selecting the 3d box.

 ChangeLog                 |    5 +++++
 goffice/graph/gog-graph.c |    4 +++-
 2 files changed, 8 insertions(+), 1 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index 2a6a4bd..9cde2f1 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2014-05-10  Jean Brefort  <jean brefort normalesup org>
+
+       * goffice/graph/gog-graph.c (gog_graph_view_render): don't crash when
+       selecting the 3d box.
+
 2014-05-08  Morten Welinder  <terra gnome org>
 
        * goffice/utils/go-style.c (go_style_sax_load_line): Read
diff --git a/goffice/graph/gog-graph.c b/goffice/graph/gog-graph.c
index 8c45a48..b1346ab 100644
--- a/goffice/graph/gog-graph.c
+++ b/goffice/graph/gog-graph.c
@@ -1037,7 +1037,9 @@ gog_graph_view_render  (GogView *view, GogViewAllocation const *bbox)
                gog_view_render (ptr->data, bbox);
        }
 
-       if (gview->selected_view != NULL)
+       if (gview->selected_view != NULL &&
+           GOG_IS_STYLED_OBJECT (gview->selected_view->model) &&
+           !gview->selected_view->model->invisible)
                gog_view_render_toolkit (gview->selected_view);
 }