Fix issue where OldComputer crashes upon inserting the final disk. Add a message instructing player to press [E] to exit the game.

old_computer.gd

@@ -22,14 +22,27 @@ func load_disk(disk_num: int) -> bool:
 		[disk_num, len(disks_wanted) + len(disks_loaded), get_memory_integrity()]
 	)
 
+	if has_finished_initialization():
+		printline(
+			">> System initialization complete. Beginning reactivation sequence."
+		)
+		printline(
+			">> Player: Press [E] or [Space] to return to the outside world."
+		)
+
 	return true
 
 func get_next_disk_num() -> int:
+	if disks_wanted.is_empty():
+		return 0
 	return disks_wanted.front()
 
 func get_memory_integrity():
 	return 100.0 / total_integrity * (starting_integrity + len(disks_loaded))
 
+func has_finished_initialization() -> bool:
+	return disks_wanted.is_empty()
+
 func open() -> void:
 	visible = true