D-Bus: Don't disconnect client for calling on non-existing interface.
D-Bus: Don't disconnect client for calling on non-existing interface.

This starts to happen now with the changed Account notification
patterns, where we might call GetIconDataURL on an already deleted
account.

Closes #152

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

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