FIX: exception with triggerRefresh and subcat listing (PR #8131)

Clicking fast on the “top”, “unread”, or “latest” button when browsing a parent category page with subcategories and the setting Show subcategory list above topics in this category enabled would cause an exception:

Uncaught Error: Nothing handled the action 'triggerRefresh'. If you did handle the action, this error can be caused by returning true from an action handler in a controller, causing the action to bubble.

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