[Fix #12079] Fix an error for Style/MixinGrouping

Fixes #12079.

This PR fixes an error for `Style/MixinGrouping` when mixin method has no arguments.

changelog/fix_an_error_for_style_mixin_grouping.md

@@ -0,0 +1 @@
+* [#12079](https://github.com/rubocop/rubocop/issues/12079): Fix an error for `Style/MixinGrouping` when mixin method has no arguments. ([@koic][])

lib/rubocop/cop/style/mixin_grouping.rb

@@ -40,7 +40,7 @@ class MixinGrouping < Base
         def on_class(node)
           begin_node = node.child_nodes.find(&:begin_type?) || node
           begin_node.each_child_node(:send).select(&:macro?).each do |macro|
-            next unless MIXIN_METHODS.include?(macro.method_name)
+            next if !MIXIN_METHODS.include?(macro.method_name) || macro.arguments.empty?
 
             check(macro)
           end

spec/rubocop/cop/style/mixin_grouping_spec.rb

@@ -42,6 +42,14 @@ class Foo
           end
         RUBY
       end
+
+      it 'does not register an offense when `include` has no arguments' do
+        expect_no_offenses(<<~RUBY)
+          class Foo
+            include
+          end
+        RUBY
+      end
     end
 
     context 'when using `extend`' do
@@ -60,6 +68,14 @@ class Foo
           end
         RUBY
       end
+
+      it 'does not register an offense when `extend` has no arguments' do
+        expect_no_offenses(<<~RUBY)
+          class Foo
+            extend
+          end
+        RUBY
+      end
     end
 
     context 'when using `prepend`' do
@@ -78,6 +94,14 @@ class Foo
           end
         RUBY
       end
+
+      it 'does not register an offense when `prepend` has no arguments' do
+        expect_no_offenses(<<~RUBY)
+          class Foo
+            prepend
+          end
+        RUBY
+      end
     end
 
     context 'when using a mix of different methods' do