Candidate details should not be deleted after UnregisterCandidate is called

[enlight]

Currently if UnregisterCandidate is used to unregister a candidate then all candidate details (name, description etc.) are deleted after the next election. When a candidate is unregistered there may still be delegations to the corresponding validator. Delegators should be able to see the details of the candidate they have delegations for even after the candidate is unregistered.

[pathornteng]

Can't we just redelegate all delegations on unregistered candidate to the limbo validator?

[enlight]

Delegations to the limbo validator earn 5% right now, right?

[pathornteng]

yes, I think so.