1348: right click context menu items not disabled [#7342]

[Dreadlau]

1) Go to now playing node in details view.
2) Make a short now playing list so that there is empty space below it.
3) Right click on the empty space to bring the context menu.
=> Most items are not disabled.

See screenshot:

[Lowlander]

I can reproduce. Added as: http://www.ventismedia.com/mantis/view.php?id=7342