Avoid gear update for empty random vehicles

There is no need to update the inventory if no loot was added.

My mistake from d98025c

SQF/dayz_server/compile/spawn_vehicles.sqf

@@ -82,6 +82,9 @@ if (count AllowedVehiclesList == 0) then {
 		};
 
 		[_veh,[_dir,_objPosition],_vehicle,true,"0"] call server_publishVeh;
+		
+		if (_num > 0) then {
 			_vehiclesToUpdate set [count _vehiclesToUpdate,_veh];
 		};
+	};
 };