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Design an empty state

What does an app look like when there's nothing to show? A gallery bound to Tasks renders every row it's given, so if a filter or search ever narrows that down to zero matches, the gallery just becomes an empty rectangle, no explanation for the person using it.

Say you add a Label with the text "No matching tasks.", positioned over the gallery area, and you want it to appear only when the gallery has zero rows.

Which property, set to which formula, makes that happen?

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