def do_logout(user):
  return None
Verify that feature makes sense in context of distribution
dataset/ETHPy150Open benadida/helios-server/helios_auth/auth_systems/yahoo.py/do_logout--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/setuptools-0.6c11/setuptools/dist.py/Feature.validate