Deskbar - Empty Recent applications expands outside of screen

[deejam]

When Deskbar is in its standard position (upper-right), an empty Recent applications will expand to the right – outside the screen.

Compared to having Deskbar on the left side of the screen.

I would suggest that no submenu would be shown if it is <empty>. The same as proposed for applications in #4276.

GCC2 Hybrid hrev40735.