Proto: fix error raised when no commitment can be cemented

Merged Valentin Chaboche requested to merge vch9@scoru@not-disputed into master


Closes #4530 (closed)

The current error is invalid as it can says "disputed" if the list of commitments is empty. Unfortunately (but not that much), it can not be tested, as such a situation would make the application fail earlier.

Does not require a backport.


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