chore: simplify code

[gclaramunt]

replace NonEmptyMap[Addr, Option[List[Info]]] with NonEmptyMap[Addr, List[Info]]]

[kpudlik]

That change is valid only if there is no semantic difference between list that doesn't exist and list that exists but is empty. Have you confirmed that there is no difference for that particular case?

We also often use Option[NonEmptyList[A]] for similar cases to be sure that we either do not have a list or have a list that is for sure non-empty.

[gclaramunt]

well... this is actually closer to the Option[NonEmptyList[A]] since the list comes from /cluster/info and it will never should be empty (it always include self) ... In that case I wouldn't mind too much, since is totally equivalent to List[A]