Fix `Lint/EmptyBlock` cop (#27748)

.rubocop_todo.yml

@@ -20,16 +20,6 @@ Layout/LineLength:
   Exclude:
     - 'app/models/account.rb'
 
-# Configuration parameters: AllowComments, AllowEmptyLambdas.
-Lint/EmptyBlock:
-  Exclude:
-    - 'spec/controllers/api/v2/search_controller_spec.rb'
-    - 'spec/fabricators/access_token_fabricator.rb'
-    - 'spec/fabricators/conversation_fabricator.rb'
-    - 'spec/fabricators/system_key_fabricator.rb'
-    - 'spec/lib/activitypub/adapter_spec.rb'
-    - 'spec/models/user_role_spec.rb'
-
 Lint/NonLocalExitFromIterator:
   Exclude:
     - 'app/helpers/jsonld_helper.rb'

spec/controllers/api/v2/search_controller_spec.rb

@@ -53,7 +53,7 @@ RSpec.describe Api::V2::SearchController do
 
   context 'without token' do
     describe 'GET #index' do
-      let(:search_params) {}
+      let(:search_params) { nil }
 
       before do
         get :index, params: search_params

spec/fabricators/access_token_fabricator.rb

@@ -1,4 +1,3 @@
 # frozen_string_literal: true
 
-Fabricator :access_token, from: 'Doorkeeper::AccessToken' do
-end
+Fabricator :access_token, from: 'Doorkeeper::AccessToken'

spec/fabricators/conversation_fabricator.rb

@@ -1,4 +1,3 @@
 # frozen_string_literal: true
 
-Fabricator(:conversation) do
-end
+Fabricator(:conversation)

spec/fabricators/system_key_fabricator.rb

@@ -1,4 +1,3 @@
 # frozen_string_literal: true
 
-Fabricator(:system_key) do
-end
+Fabricator(:system_key)

spec/lib/activitypub/adapter_spec.rb

@@ -53,7 +53,7 @@ RSpec.describe ActivityPub::Adapter do
   describe '#serializable_hash' do
     subject { ActiveModelSerializers::SerializableResource.new(TestObject.new(foo: 'bar'), serializer: serializer_class, adapter: described_class).as_json }
 
-    let(:serializer_class) {}
+    let(:serializer_class) { nil }
 
     context 'when serializer defines no context' do
       let(:serializer_class) { TestWithBasicContextSerializer }

spec/models/user_role_spec.rb

@@ -60,7 +60,7 @@ RSpec.describe UserRole do
   end
 
   describe '#permissions_as_keys=' do
-    let(:input) {}
+    let(:input) { nil }
 
     before do
       subject.permissions_as_keys = input