EmptyConditionalBody AllowedComments doesn't work for if/unless correctly

[matthewhively]

Expected behavior

As documented here: https://www.rubydoc.info/gems/rubocop/RuboCop/Cop/Lint/EmptyConditionalBody
Checks for the presence of ‘if`, `elsif` and `unless` branches without a body.
Expect AllowComments to work for both if/unless and elsif blocks

Actual behavior

AllowComments works for if/unless blocks only when there is no elsif/else and code after the block ends at the same nesting level.
AllowComments always works of elsif` blocks

Steps to reproduce the problem

Based on documentation all of these should be allowed when AllowComments: true
test code:

module Something

  def method1(foobar, barfoo)
    puts 'lets do something'
    if foobar # 1
      puts 'testing the conditional'
    end
    unless barfoo # 1
      # no error
    end
    puts 'foobar'
  end

  def method2(foobar, barfoo)
    puts 'lets do something'
    if foobar # 2
      puts 'testing the conditional'
    end
    unless barfoo # 2
      # issue found!
    end
    #puts 'foobar'
  end

  def method3(foobar, barfoo)
    puts 'lets do something'
    if foobar # 3
      # no error
    end
    unless barfoo # 3
      # issue found!
    end
  end

  def method4(foobar)
    puts 'lets do something'
    if foobar # 4
      # no error
    end
    puts 'foobar'
  end

  def method5(foobar)
    puts 'lets do something'
    if foobar # 5
      # issue found!
    end
  end

  def method6(foobar, barfoo)
    puts 'lets do something'
    if foobar # 6
      # no error
    elsif barfoo # 6
      # no error
    end
  end

  def method7(foobar)
    puts 'lets do something'
    if foobar # 7
      # no error
    else # 7
      puts 'hello'
    end
  end

  def method8(foobar, barfoo)
    puts 'lets do something'
    if foobar # 8
      puts 'foobar'
      if barfoo # 8
        # issue found!
      end
    end
    puts 'hello'
  end

  def method9(foobar, barfoo)
    puts 'lets do something'
    if foobar # 9
      puts 'foobar'
      if barfoo # 9
        # no error
      end
      puts 'hello'
    end
  end

end

test config:

require:
  - rubocop-performance
  - rubocop-rails

AllCops:
  TargetRubyVersion: 2.7

Lint/EmptyConditionalBody:
  AllowComments: true
  Enabled: true

test command and output:

rubocop --only Lint/EmptyConditionalBody test.rb
Inspecting 1 file
W

Offenses:

test.rb:19:5: W: [Correctable] Lint/EmptyConditionalBody: Avoid unless branches without a body.
    unless barfoo # 2 ...
    ^^^^^^^^^^^^^^^^^
test.rb:30:5: W: [Correctable] Lint/EmptyConditionalBody: Avoid unless branches without a body.
    unless barfoo # 3 ...
    ^^^^^^^^^^^^^^^^^
test.rb:45:5: W: [Correctable] Lint/EmptyConditionalBody: Avoid if branches without a body.
    if foobar # 5 ...
    ^^^^^^^^^^^^^
test.rb:72:7: W: [Correctable] Lint/EmptyConditionalBody: Avoid if branches without a body.
      if barfoo # 8 ...
      ^^^^^^^^^^^^^

There may be more weird edge cases, but this is as far down this rabbit-hole as I choose to go for now.

RuboCop version

rubocop -V
1.57.1 (using Parser 3.2.2.4, rubocop-ast 1.29.0, running on ruby 2.7.8) [x86_64-darwin21]
  - rubocop-performance 1.19.1
  - rubocop-rails 2.21.2