Prevent MPD widget from crashing on missing metadata
Prevent MPD widget from crashing on missing metadata

Closes #296

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