datastax/python-driver — pull request #53 by mpenick (2013-11-18 23:01:23+00:00)
Title: Not checking None result

None is returned from ```Session.add_or_renew_pool()``` when the load balancer policy returns ```HostDistance.IGNORED```. This is appended to the futures list without a None check. These None values eventually get a method call and bomb.