If command existed, you could do this:
1. Start a game with player unit
2. Execute `player addBackpack "B_UGV_02_Demining_backpack_F"`;
3. Execute `getBackpackVehicle unitBackpack player`, should return null
4. Assemble the drone, pack is back up and pick the backpack off the ground
5. Execute `getBackpackVehicle unitBackpack player` again, should return assembled but hidden drone