Pop up Window, if a CMS Item is filled in with Information

Hi there,

I need your help, because after a long search I have found nothing.

I want a pop up when my customer has written something in his collection “Important News”.

If the collection is empty, the pop up should not be visible. Only when he enters something, the pop up should appear.

To make the pop up is no problem, but I ask myself how to make it appear only if it has a content.

I would be very happy about yours, because this is an important customer.

Thanks already and best greetings from Munich

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