Add visual cue for widgets with dead comms

Part of the new widget feature set where widgets can exist on the page while being stale, i.e. page refresh, kernel restart, etc... 
-1 to using LESS like that, if it's even possible. If we need to do a rename at some point, getting clever with LESS variables doesn't avoid that need - it just splits it into a big change of the LESS and a later big change of the CSS. Let's keep things simple.