glade_gtk_cell_renderer_sync_attributes() crashes sometimes.

I think this code:
  /* Apply attributes to renderer when bound to a model in runtime */
  widget = glade_widget_get_from_gobject (object);
  if (widget->parent == NULL) return FALSE;

Should be changed to:
  GladeWidget *parent;
  /* Apply attributes to renderer when bound to a model in runtime */
  widget = glade_widget_get_from_gobject (object);
  parent = glade_widget_get_parent (widget);
  if (parent == NULL)
    return FALSE;

Thats the code used in master for the new version of Glade and should be backported to 3.8.x.

While you are there, please notice the double call to
  widget = glade_widget_get_from_gobject (object);
Maybe it is unnecessary (that double call is also in Master).

Thanks!!! Have a good 2013!