VLC 4: Do not show vlc://nop when it adds no further value

Showing the vlc://nop URL to the user when it adds nothing of value to the item is rather confusing, for example here:

Ideally this would be hidden as it does not add context (like where it will actually resolve to) so it's not really useful information.

changed milestone to %Qt redesign (VLC 4.0)

added Component::Interface: Qt label

I believe the issue will also exist when creating formatted title/nowplaying meta

mentioned in merge request leon.vitanos/vlc!3 (closed)

This is a little misleading. Empty non-leaf nodes should not be shown in flat lists, only in trees.

In the first place, they should probably not be in flat list views at all though; this is not really a GUI problem. On the other hand, service discovery still need a mean to group their items logically.

mentioned in merge request leon.vitanos/vlc!4 (closed)

mentioned in merge request !2125 (merged)

closed with commit b7fe7d66

closed with merge request !2125 (merged)

changed milestone to %4.0