how to test whether a Gtk::TreePath is null

[Ferenc Gerlits <fgerlits gmail com>]

Hi,

There is a get_dest_row_at_pos() method in TreeView which sometimes 
returns null for a TreePath.  The only way I could find for testing 
whether the path is null is through gobj().  Code snippet:

...
Gtk::TreePath        path;
treeView->get_dest_row_at_pos (x, y, path, pos);

if (path.gobj () != 0) {
    iter = treeModel->get_iter (path);
} else {
    iter = treeModel->append ();
}
...

Is there a reason why get_dest_row_at_pos() returns null instead of an 
empty path?  And is there a better way for testing whether a TreePath is 
null?

Ferenc