[0.7.1] Crash when unfitting items from armor

[Heinrich]

Shift-clicking an item in the armor fitting dialog while the game is paused causes a crash.

To reproduce:
- equip some modular armor
- fit something to the armor
- pause the game while the fitting dialog is open
- SHIFT - click an item to remove it
---> crash

[kovarex]

Thank you for the report, it will get fixed in 0.7.2