Test fix for packages crash

source/ubinstall-gtk-packages.c

@@ -165,7 +165,7 @@ void yon_on_packages_selected(GtkWidget *, main_window *widgets){
     gtk_tree_model_get(model,&iter,3,&status,-1);
     if (status)
     return;
-    gtk_tree_model_iter_children(model,&cur_parent,&iter);
+    if (!gtk_tree_model_iter_children(model,&cur_parent,&iter)) return;
     gtk_tree_model_get(model,&cur_parent,3,&status,-1);
     if (status){
         GtkTreePath *path = gtk_tree_model_get_path(model,&cur_parent);