Commits on Sep 17, 2020

1. Fix an error for Lint/UselessTimes …

   This PR fixes the following error for `Lint/UselessTimes`
   when using empty block argument.
   
   ```console
   % cat example.rb
   def foo
     1.times do
     end
   end
   
   % rubocop --only Lint/UselessTimes -d
   (snip)
   
   Inspecting 1 file
   Scanning /Users/koic/src/github.com/koic/rubocop-issues/bar/example.rb
   An error occurred while Lint/UselessTimes cop was inspecting
   /Users/koic/src/github.com/koic/rubocop-issues/bar/example.rb:2:2.
   undefined method `source' for nil:NilClass
   /Users/koic/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.91.0/
   lib/rubocop/cop/lint/useless_times.rb:76:in `autocorrect_block'
   /Users/koic/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.91.0/
   lib/rubocop/cop/lint/useless_times.rb:57:in `block in on_send'
   /Users/koic/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.91.0/
   lib/rubocop/cop/base.rb:333:in `correct'
   /Users/koic/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.91.0/
   lib/rubocop/cop/base.rb:126:in `add_offense'
   /Users/koic/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rubocop-0.91.0/
   lib/rubocop/cop/lint/useless_times.rb:49:in `on_send'
   ```

   

   koic committed Sep 17, 2020
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