Remove Focus if Focus is no longer visible

app/Elements/Modules/HyperlinkHandler.ts

@@ -46,7 +46,7 @@ module Elements.HyperlinkHandler {
 
     export async function hyperlinkObject (thing? : any) {
         resetAvailableActions();
-        if (thing instanceof Thing && thing != WorldState.player) {
+        if (thing instanceof Thing && thing != WorldState.player && thing.isVisibleTo(WorldState.player)) {
             await HyperlinkingRulebook.execute({noun: thing});
 
             currentActionTarget.nodeValue = thing.getPrintedName() + ": ";