Enforce no empty lines around class body in rubygems

To normalize the code style with `bundler`.

lib/rubygems/commands/lock_command.rb

@@ -2,7 +2,6 @@
 require 'rubygems/command'
 
 class Gem::Commands::LockCommand < Gem::Command
-
   def initialize
     super 'lock', 'Generate a lockdown list of gems',
           :strict => false
@@ -106,5 +105,4 @@ lock it down to the exact version.
 
     gemspecs.find {|path| File.exist? path }
   end
-
 end