[Panel] Structure field: empty fields displayed differently

[wottpal]

In the Starterkit when I add an empty item in Restaurant-Menu there is an ellipsis for empty fields (…) and in the Form-Demo (Kitchensink) the fields are just empty when there is no content.

(... moved to its own issue https://github.com/k-next/kirby/issues/577)

But like always - not very important.

[distantnative]

I split it up into 2 issues: https://github.com/k-next/kirby/issues/577

[bastianallgeier]

✅