Commits on Sep 21, 2020

1. Fix an incorrect auto-correct for Style/MultilineWhenThen …

   This PR fixes the following incorrect auto-correct for `Style/MultilineWhenThen`
   when line break for multiple condidate values of `when` statement.
   
   ```console
   % cat example.rb
   case condition
   when :foo,
        :bar then nil
   end
   
   % rubocop -a
   (snip)
   
   E
   
   Offenses:
   
   example.rb:3:11: E: Lint/Syntax: unexpected token kNIL
   (Using Ruby 2.7 parser; configure using TargetRubyVersion parameter,
   under AllCops)
        :bar nil
             ^^^
   example.rb:3:11: C: [Corrected] Style/MultilineWhenThen: Do not use then
   for multiline when statement.
        :bar then nil
             ^^^^
   
   1 file inspected, 2 offenses detected, 1 offense corrected
   
   % cat example.rb
   case condition
   when :foo,
        :bar nil
   end
   
   % ruby -c example.rb
   example.rb:3: syntax error, unexpected `nil', expecting `then' or ',' or
   ';' or '\n'
        :bar nil
   ```

   

   koic committed Sep 21, 2020
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