is
Returns true if the exit location on the conveyor is blocked. Blocked means that an entity has control of the cell. A blockage causes non-accumulating conveyors to stop. For accumulating conveyors, items can continue moving until they reach the blockage and cannot move forward through the blockage. An exit location is blocked when the item occupying the exit cell has reached its destination while still on the conveyor. The exit cell becomes unblocked the instant that the item is fully off of the conveyor