Nate Graham authored Nov 17, 2020 and Elvis Angelaccio committed Nov 28, 2020

Throughout our QML-based software, we now display placeholder text for
empty views so that the user knows that the view is actually empty, and
it's not that the software is just broken.

This commit introduces the same thing for Dolphin's main view.

BUG: 429248
BUG: 426354
FIXED-IN: 21.04