1) Launched Arma3 Alpha
2) Launch Editor
3) Place player unit of any type.
4) Place empty game logic unit. In the initialization field of the game logic unit, paste:
"testBuilding = "Land_i_Shop_02_V1_F" createVehicle (position this); hint (format ["%1", (testBuilding buildingExit 0)]);"
with no double quotes. This will create a "Land_i_Shop_02_V1_F" object and then display a hint showing the position of the exit at index 0.
5) Preview
6) Observe the hint "[0,0,0]" in the upper right hand corner of the screen, indicating that there is no exit at index 0, and therefore there are no exits.