Fix bugs when name or twitter username are null
Fix bugs when name or twitter username are null

pydanny/cookiecutter-django,pydanny/cookiecutter-django,luzfcb/cookiecutter-django,pydanny/cookiecutter-django,ryankanno/cookiecutter-django,ryankanno/cookiecutter-django,pydanny/cookiecutter-django,ryankanno/cookiecutter-django,trungdong/cookiecutter-django,luzfcb/cookiecutter-django,trungdong/cookiecutter-django,ryankanno/cookiecutter-django,luzfcb/cookiecutter-django,trungdong/cookiecutter-django,trungdong/cookiecutter-django,luzfcb/cookiecutter-django