[glom/gtktoolpallete] Check a pointer for null, though it shouldn't happen now.

[Murray Cumming <murrayc src gnome org>]

commit 482950cf11c5b0b51270b8c63c168daefffad47e
Author: Murray Cumming <murrayc murrayc com>
Date:   Tue Dec 22 16:14:56 2009 +0100

    Check a pointer for null, though it shouldn't happen now.

 glom/utility_widgets/flowtable_dnd.cc |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/glom/utility_widgets/flowtable_dnd.cc b/glom/utility_widgets/flowtable_dnd.cc
index 218b7f1..5652e7c 100644
--- a/glom/utility_widgets/flowtable_dnd.cc
+++ b/glom/utility_widgets/flowtable_dnd.cc
@@ -191,8 +191,11 @@ void FlowTableDnd::on_drag_data_received(const Glib::RefPtr<Gdk::DragContext>& d
   if(palette)
   {
     Gtk::Widget* tool_item = palette->get_drag_item(selection_data);
-    const int type = GPOINTER_TO_INT(tool_item->get_data("glom-type"));
-    on_dnd_add_layout_item_by_type(type, above);
+    if(tool_item)
+    {
+      const int type = GPOINTER_TO_INT(tool_item->get_data("glom-type"));
+      on_dnd_add_layout_item_by_type(type, above);
+    }
   }
   else
   {