Use `is` operator for comparing with `None` (Pep8)
Use `is` operator for comparing with `None` (Pep8)

michi88/Zappa,Miserlou/Zappa,anush0247/Zappa,Miserlou/Zappa,scoates/Zappa,pjz/Zappa,pjz/Zappa,michi88/Zappa,longzhi/Zappa,mathom/Zappa,mathom/Zappa,parroyo/Zappa,anush0247/Zappa,parroyo/Zappa,longzhi/Zappa,scoates/Zappa