xcbq: Catch, log and ignore X errors in GetProperty
xcbq: Catch, log and ignore X errors in GetProperty

Letting these propagate breaks things badly in many places that don't
expect it. Also None is an acceptable return value for this function

jdowner/qtile,nxnfufunezn/qtile,ramnes/qtile,zordsdavini/qtile,dequis/qtile,flacjacket/qtile,rxcomm/qtile,de-vri-es/qtile,qtile/qtile,himaaaatti/qtile,dequis/qtile,flacjacket/qtile,de-vri-es/qtile,soulchainer/qtile,jdowner/qtile,qtile/qtile,xplv/qtile,kynikos/qtile,tych0/qtile,kynikos/qtile,xplv/qtile,tych0/qtile,soulchainer/qtile,ramnes/qtile,zordsdavini/qtile,frostidaho/qtile,rxcomm/qtile,StephenBarnes/qtile,nxnfufunezn/qtile,himaaaatti/qtile,frostidaho/qtile,cortesi/qtile,StephenBarnes/qtile,cortesi/qtile