Put environment configuration file in a list
Put environment configuration file in a list

And skip None case cleanly

rouge8/pip,rouge8/pip,xavfernandez/pip,pfmoore/pip,RonnyPfannschmidt/pip,xavfernandez/pip,pypa/pip,zvezdan/pip,techtonik/pip,rouge8/pip,pradyunsg/pip,zvezdan/pip,pradyunsg/pip,sbidoul/pip,techtonik/pip,RonnyPfannschmidt/pip,sbidoul/pip,xavfernandez/pip,zvezdan/pip,techtonik/pip,pfmoore/pip,pypa/pip,RonnyPfannschmidt/pip