web: Explicitly use empty string for CPU column when stopped.
web: Explicitly use empty string for CPU column when stopped.

Otherwise, it remains at "0%" when stopping a container, because
$(..).text(undefined) doesn't have any effect.

Closes #350

Reviewed-by: Stef Walter <8a7fbf0f15d3ad982af54ef28f5c117d2494b76c@redhat.com>

evol262/cockpit,sgallagher/cockpit,stefwalter/cockpit,mareklibra/cockpit,Thermionix/cockpit,dperpeet/cockpit,mvollmer/cockpit,Scribery/cockpit,firebitsbr/cockpit,jscotka/cockpit,stefwalter/cockpit,vanloswang/cockpit,maxamillion/cockpit,vbatts/cockpit,vanloswang/cockpit,Armstrong1992/cockpit,andreasn/cockpit,zigitax/cockpit,fridex/cockpit,moolitayer/cockpit,matobet/cockpit,dperpeet/cockpit,petervo/cockpit,firebitsbr/cockpit,Scribery/cockpit,sub-mod/cockpit,andreasn/cockpit,vanloswang/cockpit,sgallagher/cockpit,denysvitali/cockpit,Thermionix/cockpit,Thermionix/cockpit,kkaempf/cockpit,deryni/cockpit,fridex/cockpit,Armstrong1992/cockpit,mareklibra/cockpit,maxamillion/cockpit,maxamillion/cockpit,kkaempf/cockpit,maxamillion/cockpit,martinpitt/cockpit,Scribery/cockpit,michalskrivanek/cockpit,dperpeet/cockpit,cockpituous/cockpit,nmav/cockpit,larskarlitski/cockpit,matobet/cockpit,cockpituous/cockpit,petervo/cockpit,netzvieh/cockpit,jscotka/cockpit,Scribery/cockpit,martinpitt/cockpit,vbatts/cockpit,kkaempf/cockpit,andreasn/cockpit,dperpeet/cockpit,Scribery/cockpit,zigitax/cockpit,michalskrivanek/cockpit,darioajr/cockpit,moolitayer/cockpit,nmav/cockpit,arilivigni/cockpit,martinpitt/cockpit,arilivigni/cockpit,netzvieh/cockpit,michalskrivanek/cockpit,firebitsbr/cockpit,martinpitt/cockpit,Thermionix/cockpit,evol262/cockpit,cockpit-project/cockpit,larskarlitski/cockpit,nmav/cockpit,fridex/cockpit,cockpit-project/cockpit,netzvieh/cockpit,deryni/cockpit,zigitax/cockpit,stefwalter/cockpit,jscotka/cockpit,mvollmer/cockpit,moraleslazaro/cockpit,michalskrivanek/cockpit,cockpit-project/cockpit,xhad/cockpit,deryni/cockpit,petervo/cockpit,deryni/cockpit,cockpituous/cockpit,matobet/cockpit,dperpeet/cockpit,FireDrunk/cockpit,SotolitoLabs/cockpit,Scribery/cockpit,haiyangd/cockpit_view,andreasn/cockpit,deryni/cockpit,cockpit-project/cockpit,vanloswang/cockpit,netzvieh/cockpit,petervo/cockpit,moraleslazaro/cockpit,sub-mod/cockpit,jscotka/cockpit,SotolitoLabs/cockpit,harishanand95/cockpit,larskarlitski/cockpit,SotolitoLabs/cockpit,harishanand95/cockpit,moraleslazaro/cockpit,mareklibra/cockpit,SotolitoLabs/cockpit,arilivigni/cockpit,cockpituous/cockpit,evol262/cockpit,darioajr/cockpit,matobet/cockpit,cockpituous/cockpit,Thermionix/cockpit,larsu/cockpit,vanloswang/cockpit,garrett/cockpit,sgallagher/cockpit,petervo/cockpit,mareklibra/cockpit,sgallagher/cockpit,evol262/cockpit,denysvitali/cockpit,moraleslazaro/cockpit,evol262/cockpit,arilivigni/cockpit,sub-mod/cockpit,andreasn/cockpit,xhad/cockpit,Thermionix/cockpit,Armstrong1992/cockpit,garrett/cockpit,stefwalter/cockpit,haiyangd/cockpit_view,denysvitali/cockpit,kkaempf/cockpit,garrett/cockpit,haiyangd/cockpit_view,nmav/cockpit,harishanand95/cockpit,xhad/cockpit,denysvitali/cockpit,darioajr/cockpit,FireDrunk/cockpit,FireDrunk/cockpit,denysvitali/cockpit,mvollmer/cockpit,dperpeet/cockpit,mareklibra/cockpit,zigitax/cockpit,mvollmer/cockpit,xhad/cockpit,jscotka/cockpit,andreasn/cockpit,sgallagher/cockpit,vbatts/cockpit,moraleslazaro/cockpit,evol262/cockpit,larskarlitski/cockpit,darioajr/cockpit,vbatts/cockpit,sub-mod/cockpit,andreasn/cockpit,darioajr/cockpit,sgallagher/cockpit,arilivigni/cockpit,martinpitt/cockpit,fridex/cockpit,moraleslazaro/cockpit,moolitayer/cockpit,petervo/cockpit,nmav/cockpit,vanloswang/cockpit,haiyangd/cockpit_view,larskarlitski/cockpit,SotolitoLabs/cockpit,michalskrivanek/cockpit,arilivigni/cockpit,cockpituous/cockpit,maxamillion/cockpit,stefwalter/cockpit,Armstrong1992/cockpit,stefwalter/cockpit,garrett/cockpit,zigitax/cockpit,Scribery/cockpit,firebitsbr/cockpit,garrett/cockpit,larskarlitski/cockpit,mareklibra/cockpit,netzvieh/cockpit,sgallagher/cockpit,xhad/cockpit,cockpit-project/cockpit,xhad/cockpit,larsu/cockpit,FireDrunk/cockpit,larsu/cockpit,netzvieh/cockpit,moolitayer/cockpit,SotolitoLabs/cockpit,mvollmer/cockpit,fridex/cockpit,larsu/cockpit,moraleslazaro/cockpit,matobet/cockpit,moolitayer/cockpit,vanloswang/cockpit,larskarlitski/cockpit,matobet/cockpit,arilivigni/cockpit,sub-mod/cockpit,harishanand95/cockpit,deryni/cockpit,harishanand95/cockpit,michalskrivanek/cockpit,firebitsbr/cockpit,larsu/cockpit,haiyangd/cockpit_view,vbatts/cockpit,dperpeet/cockpit,FireDrunk/cockpit,stefwalter/cockpit,xhad/cockpit,harishanand95/cockpit,SotolitoLabs/cockpit,petervo/cockpit,mareklibra/cockpit,fridex/cockpit,deryni/cockpit,larsu/cockpit,michalskrivanek/cockpit,vbatts/cockpit,kkaempf/cockpit,harishanand95/cockpit,jscotka/cockpit,Armstrong1992/cockpit