Add and apply Lint/EmptyBlock rubocop rule

It was introduced in Rubocop 1.1.0.

.rubocop.yml

@@ -163,6 +163,9 @@ Lint/ConstantDefinitionInBlock:
 Lint/DuplicateMethods:
   Enabled: true
 
+Lint/EmptyBlock:
+  Enabled: true
+
 Lint/EmptyFile:
   Enabled: true
 

spec/factories/administration.rb

@@ -91,8 +91,7 @@ FactoryBot.define do
     end
   end
 
-  factory :widget_feed, class: "Widget::Feed" do
-  end
+  factory :widget_feed, class: "Widget::Feed"
 
   factory :i18n_content, class: "I18nContent" do
     key { "debates.index.section_footer.description" }

spec/factories/polls.rb

@@ -214,6 +214,5 @@ FactoryBot.define do
     end
   end
 
-  factory :active_poll do
-  end
+  factory :active_poll
 end

spec/models/poll/poll_spec.rb

@@ -36,8 +36,7 @@ describe Poll do
       expect(poll).not_to be_valid
     end
 
-    it "no overlapping polls for proposal polls are allowed" do
-    end
+    pending "no overlapping polls for proposal polls are allowed"
   end
 
   describe "proposal polls specific validations" do

spec/system/emails_spec.rb

@@ -316,8 +316,7 @@ describe "Emails" do
       expect { open_last_email }.to raise_error "No email has been sent!"
     end
 
-    xscenario "Delete all Notifications included in the digest after email sent" do
-    end
+    xscenario "Delete all Notifications included in the digest after email sent"
   end
 
   context "User invites" do