Don't die if amixer returns an error
Don't die if amixer returns an error

The volume widget seems to die at various points due to a bad amixer
invocation. It's not immediately obvious why amixer fails at some points but
not others, though. However, the volume widget shouldn't die when this
happens.

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