We were very inconsistent regarding these rules.
Personally I prefer no empty lines around blocks, clases, etc... as
recommended by the Ruby style guide [1], and they're the default values
in rubocop, so those are the settings I'm applying.
The exception is the `private` access modifier, since we were leaving
empty lines around it most of the time. That's the default rubocop rule
as well. Personally I don't have a strong preference about this one.
[1] https://rubystyle.guide/#empty-lines-around-bodies
As we are using an attr_accessor to make sure a user accepts that the
proposal “has no map”, the validation was being run in every save.
Making other things break, for example the updating of the counter
cache `cached_votes_up`, when someone voted for the proposal, as the
attr_accessor `skip_map` was not present
