`FaultPath` generation bug

- distinguish between the following two cases:
![image](https://github.com/tbohne/vehicle_diag_smach/assets/19288735/6c17b40d-6508-48db-bab9-1b5b27673faa) ![image](https://github.com/tbohne/vehicle_diag_smach/assets/19288735/6b0d5513-37ce-489c-93da-63df12352c56)
- atm both lead to:
![image](https://github.com/tbohne/vehicle_diag_smach/assets/19288735/104f232d-91be-4700-8475-7b6deaee5b5a)


