Removed last == and != Nones in group.py
Removed last == and != Nones in group.py

git-svn-id: cc8d88c80cd5d51cbb0fdfc16851f639b290ec3b@2806 fa922fa7-2fde-0310-acd8-f43f465a7996

joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue