`select_first_candidate` returns a `InternalSelectionError::NotFound` if there are no candidates - that should be `InternalSelectionError::Empty` instead. _Originally posted by @spacebear21 in https://github.com/payjoin/rust-payjoin/pull/533#pullrequestreview-2613119394_
select_first_candidatereturns aInternalSelectionError::NotFoundif there are no candidates - that should beInternalSelectionError::Emptyinstead.Originally posted by @spacebear21 in #533 (review)