Comment 4 for bug 445640

This bug is caused by this code snippets:

if c_node_path:
    c_node_iter = self.get_iter(c_node_path)
    #self.row_inserted(c_node_path, c_node_iter)

As you can see, c_node_iter is actually not needed anymore since the following line is commented (I don't know who did this, and I don't remember doing it). As such, we can safely comment the previous two lines out without changing the behavior. That should stop this traceback from showing.