Add and apply Style/InvertibleUnlessCondition rule

This rule was added in rubocop 1.44.0. It's useful to avoid accidental
`unless !condition` clauses.

Note we aren't replacing `unless zero?` with `if nonzero?` because we
never use `nonzero?`; using it sounds like `if !zero?`.

Replacing `unless any?` with `if none?` is only consistent if we also replace
`unless present?` with `if blank?`, so we're also adding this case. For
consistency, we're also replacing `unless blank?` with `if present?`.

We're also simplifying code dealing with `> 0` conditions in order to
make the code (hopefully) easier to understand.

Also for consistency, we're enabling the `Style/InverseMethods` rule,
which follows a similar idea.

app/controllers/admin/api/stats_controller.rb

@@ -1,9 +1,9 @@
 class Admin::Api::StatsController < Admin::Api::BaseController
   def show
-    unless params[:event].present? ||
-           params[:visits].present? ||
-           params[:budget_investments].present? ||
-           params[:user_supported_budgets].present?
+    if params[:event].blank? &&
+       params[:visits].blank? &&
+       params[:budget_investments].blank? &&
+       params[:user_supported_budgets].blank?
       return render json: {}, status: :bad_request
     end
 

app/controllers/admin/local_census_records/imports_controller.rb

@@ -14,7 +14,7 @@ class Admin::LocalCensusRecords::ImportsController < Admin::LocalCensusRecords::
   private
 
     def local_census_records_import_params
-      return {} unless params[:local_census_records_import].present?
+      return {} if params[:local_census_records_import].blank?
 
       params.require(:local_census_records_import).permit(allowed_params)
     end

app/controllers/concerns/dashboard/expects_date_range.rb

@@ -4,13 +4,13 @@ module Dashboard::ExpectsDateRange
   include Dashboard::HasProposal
 
   def start_date(fallback_date = proposal.created_at.to_date)
-    return Date.parse(params[:start_date]) unless params[:start_date].blank?
+    return Date.parse(params[:start_date]) if params[:start_date].present?
 
     fallback_date
   end
 
   def end_date
-    return Date.parse(params[:end_date]) unless params[:end_date].blank?
+    return Date.parse(params[:end_date]) if params[:end_date].present?
 
     Date.current
   end

app/controllers/officing/base_controller.rb

@@ -30,7 +30,7 @@ class Officing::BaseController < ApplicationController
     end
 
     def verify_booth
-      return unless current_booth.blank?
+      return if current_booth.present?
 
       booths = current_user.poll_officer.todays_booths
       case booths.count

app/controllers/proposals_controller.rb

@@ -155,8 +155,8 @@ class ProposalsController < ApplicationController
     end
 
     def load_featured
-      return unless !@advanced_search_terms && @search_terms.blank? &&
-                    params[:retired].blank? && @current_order != "recommendations"
+      return if @advanced_search_terms || @search_terms.present? ||
+                params[:retired].present? || @current_order == "recommendations"
 
       if Setting["feature.featured_proposals"]
         @featured_proposals = Proposal.not_archived