ojii/django-cms — pull request #22 by xordoquy (2013-09-01 19:28:47+00:00)
Title: Fixed a bug when the page had no .lft or .rght

I'm not suer whether page should always have a .lft and a .rght or not.
If not it's a clean fix. Otherwise, you'll need to investigate why/how the page object came with .lft and .rght == None.