[Other issue]: Ambiguous return values for some cases

[Vortex-TH]

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Description

It should be clarified what is expected to be returned in the following cases:

    def current_floor(self) -> Optional[str]:
        ''' Returns the current floor of this lift, or None the query failed'''

What should be returned if the lift is moving between two floors? My assumption is to return the last floor it was at until it has reached the new floor.

---

    def destination_floor(self) -> Optional[str]:
        ''' Returns the destination floor of this lift, or None the query
            failed'''

What should be returned if the lift is idle at some floor? My assumption is to return the current floor.