Fix an error for Style/HashEachMethods when a block with both parameters has no body

changelog/fix_an_error_for_style_hash_each_methods.md

@@ -0,0 +1 @@
+* [#12636](https://github.com/rubocop/rubocop/pull/12636): Fix an error for `Style/HashEachMethods` when a block with both parameters has no body. ([@earlopain][])

lib/rubocop/cop/style/hash_each_methods.rb

@@ -71,6 +71,8 @@ def on_block(node)
 
         # rubocop:disable Metrics/AbcSize
         def check_unused_block_args(node, key, value)
+          return if node.body.nil?
+
           value_unused = unused_block_arg_exist?(node, value)
           key_unused = unused_block_arg_exist?(node, key)
           return if value_unused && key_unused

spec/rubocop/cop/style/hash_each_methods_spec.rb

@@ -109,6 +109,10 @@
         expect_no_offenses('foo.each { |k, v| do_something }')
       end
 
+      it 'does not register an offense when the body of `Enumerable#each` is empty' do
+        expect_no_offenses('foo.each { |k, v| }')
+      end
+
       it 'registers an offense when the rest value block argument of `Enumerable#each` method is unused' do
         expect_offense(<<~RUBY)
           foo.each { |k, *v| do_something(*v) }