Check if environment variable exists and don't error when it doesn't (on full qtile restart)
Check if environment variable exists and don't error when it doesn't (on full qtile restart)

Closes #1137

cortesi/qtile,soulchainer/qtile,ramnes/qtile,tych0/qtile,zordsdavini/qtile,soulchainer/qtile,ramnes/qtile,zordsdavini/qtile,qtile/qtile,frostidaho/qtile,flacjacket/qtile,cortesi/qtile,flacjacket/qtile,tych0/qtile,frostidaho/qtile,qtile/qtile