fixed unittest of issue #407 for Python3
fixed unittest of issue #407 for Python3

nvie/GitPython,nvie/GitPython,jeblair/GitPython,gitpython-developers/gitpython,gitpython-developers/GitPython,jeblair/GitPython,gitpython-developers/GitPython,expobrain/GitPython,gitpython-developers/gitpython,breavo/GitPython,breavo/GitPython,expobrain/GitPython