Mark empty tiles with asteriks or similar

**Is your feature request related to a problem? Please describe.**

It is currently not possible to distinguish defined and undefined/empty tiles from the dropdown list. This makes it a bit more complicated to find the next empty spot.
In addition it makes it difficult to add the tile to the shortcuts on the phone as you do not know which one is defined and which is not.

**Describe the solution you'd like**

Mark tiles that are empty/undefined with an asteriks or something in the dropdown in companion app.

In addition, add different icon to tile so it is visible as undefined when adding it to shortcuts in Android (user defined name and icon of tile are not visible before adding it to the shortcuta, so impossible to tell if tile is empty or used before selecting).

**Describe alternatives you've considered, if any**

**Additional context**