For ->(_) {}:

Failures:

  1) RuboCop::Cop::Style::ItBlockParameter >= Ruby 3.4 EnforcedStyle: always does not register an offense for block with parameter and missing body
     Failure/Error:
       node.body.each_descendant(:lvar).select do |descendant|
         descendant.source == block_argument_name
       end

     NoMethodError:
       undefined method 'each_descendant' for nil

Before submitting the PR make sure the following are checked:

• The PR relates to only one subject with a clear title and description in grammatically correct, complete sentences.
• Wrote good commit messages.
• Feature branch is up-to-date with master (if not - rebase it).
• Squashed related commits together.
• Added tests.
• Ran bundle exec rake default. It executes all tests and runs RuboCop on its own code.
• Added an entry (file) to the changelog folder named {change_type}_{change_description}.md if the new code introduces user-observable changes. See changelog entry format for details.