Commits on Apr 24, 2020

1. Fix an error when running --only or --except options …

   This PR fixes an error when running `rubocop --only` or
   `rubocop --except` options without cop name argument.
   
   ## Before
   
   ```consle
   % rubocop --only
   undefined method `empty?' for nil:NilClass
   /Users/koic/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.82.0/lib/rubocop/options.rb:87:in
   `block in add_cop_selection_csv_option'
   /Users/koic/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.82.0/lib/rubocop/options.rb:206:in
   `block in option'
   /Users/koic/.rbenv/versions/2.7.1/lib/ruby/2.7.0/optparse.rb:1589:in
   `block in parse_in_order'
   /Users/koic/.rbenv/versions/2.7.1/lib/ruby/2.7.0/optparse.rb:1575:in `catch'
   ```
   
   ## After
   
   ```console
   % rubocop --only
   --only argument should be [COP1,COP2,...].
   ```
   
   The same is true for `rubocop --except`.

   

   koic committed Apr 24, 2020
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