[Context Menu] Update specs

Update specs to reflect refactoring-out of popup elements
performed in the context of adding time conductor, WTD-1515.

platform/representation/src/actions/ContextMenuAction.js

@@ -84,8 +84,10 @@ define(
 
             // Remove the context menu
             function dismiss() {
-                popup.dismiss();
-                popup = undefined;
+                if (popup) {
+                    popup.dismiss();
+                    popup = undefined;
+                }
                 scope.$destroy();
                 body.off("mousedown", dismiss);
                 dismissExistingMenu = undefined;