Refactor error handling, fix a grab_key call.
Refactor error handling, fix a grab_key call.

Milestone: we now initialize correctly with a minimal config under xcb!

soulchainer/qtile,ramnes/qtile,xplv/qtile,qtile/qtile,de-vri-es/qtile,w1ndy/qtile,frostidaho/qtile,kiniou/qtile,aniruddhkanojia/qtile,jdowner/qtile,zordsdavini/qtile,de-vri-es/qtile,kopchik/qtile,farebord/qtile,tych0/qtile,andrewyoung1991/qtile,dequis/qtile,kynikos/qtile,tych0/qtile,kopchik/qtile,aniruddhkanojia/qtile,rxcomm/qtile,kseistrup/qtile,apinsard/qtile,qtile/qtile,w1ndy/qtile,StephenBarnes/qtile,rxcomm/qtile,himaaaatti/qtile,xplv/qtile,StephenBarnes/qtile,jdowner/qtile,encukou/qtile,himaaaatti/qtile,kynikos/qtile,EndPointCorp/qtile,kiniou/qtile,kseistrup/qtile,apinsard/qtile,farebord/qtile,nxnfufunezn/qtile,soulchainer/qtile,dequis/qtile,EndPointCorp/qtile,andrewyoung1991/qtile,encukou/qtile,nxnfufunezn/qtile,flacjacket/qtile,ramnes/qtile,flacjacket/qtile,cortesi/qtile,frostidaho/qtile,cortesi/qtile,zordsdavini/qtile