Void context in block not detected if block only contains one line

[untitaker]

Consider this code:

array.each do |_item|
  42
end

---

Expected behavior

Rubocop should emit a Lint/Void for the second line.

Actual behavior

Rubocop considers this code valid.

RuboCop version

master, or 0.52

Notes

The following code is linted as expected, until the second int literal is removed:

array.each do |_item|
  42
  42
end

[pocke]

array.each do |_item|
  42
end

array.each do |_item|
  42
  42
end

$ ruby-parse test.rb
(begin
  (block
    (send
      (send nil :array) :each)
    (args
      (procarg0 :_item))
    (int 42))
  (block
    (send
      (send nil :array) :each)
    (args
      (procarg0 :_item))
    (begin
      (int 42)
      (int 42))))

When a block body has one sentence, it does not have a begin node. The cop's checks begin and kwbegin node only, so the cop can't catch it now.
https://github.com/bbatsov/rubocop/blob/031b29b495ad435dc69172fb7603042894faae53/lib/rubocop/cop/lint/void.rb#L82-L85