Nearest target button makes noise when no item selected

[Adam Jimenez]

Steps to reproduce:

1. Target an enemy.
2. Destroy it.
3. If there are no other targets pressing R makes a noise even though it shouldn't because it can't change targets.

I was able to replicate this on the A-wing historical mission 2.

[Péter Agárdi]

An interesting addition: if you destroy the last target, computer blanks, but debris still there holding down R sounds constantly until debris gets disappears.