fix pep8 in /group/views.py
fix pep8 in /group/views.py

HaManhDong/pgscm,hieulq/pgscm,HaManhDong/pgscm,hieulq/pgscm,HaManhDong/pgscm,hieulq/pgscm,hieulq/pgscm,HaManhDong/pgscm,hieulq/pgscm,HaManhDong/pgscm