The `no quorum found` error can be opaque and lead to a lot of confusion. It is
better to give more information for this error so that it leads to easier
debugging, since it can be quite a common warning/error.
Instead of a single error, there are two cases provided: `NoCandidates` and
`Diverging`, to capture the two different variants of errors that can occur.
`Display` implementations are provided for both to provide more information.
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