Manually merged from https://github.com/rubygems/rubygems/pull/2636

Enable Style/EmptyLinesAroundClassBody rubocop cop.

lib/rubygems/user_interaction.rb

@@ -172,6 +172,7 @@ end
 # Gem::StreamUI implements a simple stream based user interface.
 
 class Gem::StreamUI
+
   extend Gem::Deprecate
 
   ##
@@ -386,6 +387,7 @@ class Gem::StreamUI
   # An absolutely silent progress reporter.
 
   class SilentProgressReporter
+
     ##
     # The count of items is never updated for the silent progress reporter.
 
@@ -410,12 +412,14 @@ class Gem::StreamUI
 
     def done
     end
+
   end
 
   ##
   # A basic dotted progress reporter.
 
   class SimpleProgressReporter
+
     include Gem::DefaultUserInteraction
 
     ##
@@ -453,12 +457,14 @@ class Gem::StreamUI
     def done
       @out.puts "\n#{@terminal_message}"
     end
+
   end
 
   ##
   # A progress reporter that prints out messages about the current progress.
 
   class VerboseProgressReporter
+
     include Gem::DefaultUserInteraction
 
     ##
@@ -495,6 +501,7 @@ class Gem::StreamUI
     def done
       @out.puts @terminal_message
     end
+
   end
 
   ##
@@ -512,6 +519,7 @@ class Gem::StreamUI
   # An absolutely silent download reporter.
 
   class SilentDownloadReporter
+
     ##
     # The silent download reporter ignores all arguments
 
@@ -537,12 +545,14 @@ class Gem::StreamUI
 
     def done
     end
+
   end
 
   ##
   # A progress reporter that behaves nicely with threaded downloading.
 
   class ThreadedDownloadReporter
+
     MUTEX = Mutex.new
 
     ##
@@ -591,7 +601,9 @@ class Gem::StreamUI
         @out.puts message
       end
     end
+
   end
+
 end
 
 ##
@@ -599,6 +611,7 @@ end
 # STDOUT, and STDERR.
 
 class Gem::ConsoleUI < Gem::StreamUI
+
   ##
   # The Console UI has no arguments as it defaults to reading input from
   # stdin, output to stdout and warnings or errors to stderr.
@@ -606,12 +619,14 @@ class Gem::ConsoleUI < Gem::StreamUI
   def initialize
     super STDIN, STDOUT, STDERR, true
   end
+
 end
 
 ##
 # SilentUI is a UI choice that is absolutely silent.
 
 class Gem::SilentUI < Gem::StreamUI
+
   ##
   # The SilentUI has no arguments as it does not use any stream.
 
@@ -637,4 +652,5 @@ class Gem::SilentUI < Gem::StreamUI
   def progress_reporter(*args) # :nodoc:
     SilentProgressReporter.new(@outs, *args)
   end
+
 end