Instance Icons: Don't fail if url is in wront instance
Instance Icons: Don't fail if url is in wront instance

Get the instance in a way that does not compare to c.instance.
get_entity_or_abort() will also raise 404 if the instance cannot
be found.

alkadis/vcv,liqd/adhocracy,SysTheron/adhocracy,DanielNeugebauer/adhocracy,liqd/adhocracy,alkadis/vcv,alkadis/vcv,phihag/adhocracy,SysTheron/adhocracy,DanielNeugebauer/adhocracy,liqd/adhocracy,SysTheron/adhocracy,DanielNeugebauer/adhocracy,alkadis/vcv,alkadis/vcv,phihag/adhocracy,phihag/adhocracy,liqd/adhocracy,DanielNeugebauer/adhocracy,phihag/adhocracy,DanielNeugebauer/adhocracy,phihag/adhocracy