Add and apply rubocop rules for empty lines

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

app/models/poll/answer.rb

@@ -1,5 +1,4 @@
 class Poll::Answer < ApplicationRecord
-
   belongs_to :question, -> { with_hidden }
   belongs_to :author, ->   { with_hidden }, class_name: "User", foreign_key: "author_id"
 

app/models/poll/ballot.rb

@@ -32,5 +32,4 @@ class Poll::Ballot < ApplicationRecord
   def not_already_added?(investment)
     ballot.lines.where(investment: investment).blank?
   end
-
 end

app/models/poll/ballot_sheet.rb

@@ -38,5 +38,4 @@ class Poll::BallotSheet < ApplicationRecord
                          poll_ballot: poll_ballot,
                          budget: poll.budget).first_or_create!
     end
-
 end

app/models/poll/officer.rb

@@ -32,6 +32,5 @@ class Poll
     def todays_booths
       officer_assignments.by_date(Date.current).map(&:booth).uniq
     end
-
   end
 end

app/models/poll/officer_assignment.rb

@@ -32,6 +32,5 @@ class Poll
     def booth
       booth_assignment.booth
     end
-
   end
 end

app/models/poll/pair_answer.rb

@@ -1,5 +1,4 @@
 class Poll::PairAnswer < ApplicationRecord
-
   belongs_to :question, -> { with_hidden }
   belongs_to :author, ->   { with_hidden }, class_name: "User", foreign_key: "author_id"
   belongs_to :answer_right, class_name: "Poll::Question::Answer", foreign_key: "answer_rigth_id"

app/models/poll/partial_result.rb

@@ -1,5 +1,4 @@
 class Poll::PartialResult < ApplicationRecord
-
   VALID_ORIGINS = %w[web booth]
 
   belongs_to :question, -> { with_hidden }

app/models/poll/question/answer.rb

@@ -97,5 +97,4 @@ class Poll::Question::Answer < ApplicationRecord
       is_most_voted = answers.none? { |a| a > total_votes }
       update!(most_voted: is_most_voted)
     end
-
 end

app/models/poll/recount.rb

@@ -1,5 +1,4 @@
 class Poll::Recount < ApplicationRecord
-
   VALID_ORIGINS = %w[web booth letter].freeze
 
   belongs_to :author, -> { with_hidden }, class_name: "User", foreign_key: "author_id"

app/models/poll/stats.rb

@@ -120,5 +120,4 @@ class Poll::Stats
     def stats_cache(key, &block)
       Rails.cache.fetch("polls_stats/#{poll.id}/#{key}/#{version}", &block)
     end
-
 end

app/models/poll/voter.rb

@@ -1,6 +1,5 @@
 class Poll
   class Voter < ApplicationRecord
-
     VALID_ORIGINS = %w[web booth letter].freeze
 
     belongs_to :poll
@@ -69,6 +68,5 @@ class Poll
           now.year - dob.year - (now.month > dob.month || (now.month == dob.month && now.day >= dob.day) ? 0 : 1)
         end
       end
-
   end
 end