Merge pull request rubocop#13062 from Earlopain/invertible-unless-emp…

…ty-braces

Fix an error for `Style/InvertibleUnlessCondition` when using empty parenthesis as condition

changelog/fix_an_error_for_style_invertible_unless_condition.md

@@ -0,0 +1 @@
+* [#13062](https://github.com/rubocop/rubocop/pull/13062): Fix an error for `Style/InvertibleUnlessCondition` when using empty parenthesis as condition. ([@earlopain][])

lib/rubocop/cop/style/invertible_unless_condition.rb

@@ -72,8 +72,8 @@ def on_if(node)
 
         private
 
-        def invertible?(node)
-          case node.type
+        def invertible?(node) # rubocop:disable Metrics/CyclomaticComplexity
+          case node&.type
           when :begin
             invertible?(node.children.first)
           when :send

spec/rubocop/cop/style/invertible_unless_condition_spec.rb

@@ -147,4 +147,16 @@
       foo if !condition
     RUBY
   end
+
+  it 'does not register an offense when using empty braces with `unless`' do
+    expect_no_offenses(<<~RUBY)
+      foo unless ()
+    RUBY
+  end
+
+  it 'does not register an offense when using empty braces with inverted `if`' do
+    expect_no_offenses(<<~RUBY)
+      foo if !()
+    RUBY
+  end
 end