Fix an error for Rails/ActiveSupportOnLoad when calling without arguments

changelog/fix_error_for_rails_active_support_load_hook.md

@@ -0,0 +1 @@
+* [#1256](https://github.com/rubocop/rubocop-rails/pull/1256): Fix an error for `Rails/ActiveSupportOnLoad` when calling without arguments. ([@earlopain][])

lib/rubocop/cop/rails/active_support_on_load.rb

@@ -57,7 +57,7 @@ class ActiveSupportOnLoad < Base
 
         def on_send(node)
           receiver, method, arguments = *node # rubocop:disable InternalAffairs/NodeDestructuring
-          return unless receiver && (hook = LOAD_HOOKS[receiver.const_name])
+          return unless arguments && (hook = LOAD_HOOKS[receiver&.const_name])
 
           preferred = "ActiveSupport.on_load(:#{hook}) { #{method} #{arguments.source} }"
           add_offense(node, message: format(MSG, prefer: preferred, current: node.source)) do |corrector|

spec/rubocop/cop/rails/active_support_on_load_spec.rb

@@ -12,6 +12,12 @@
     RUBY
   end
 
+  it 'does not add offense for include without arguments' do
+    expect_no_offenses(<<~RUBY)
+      ActiveRecord::Base.include
+    RUBY
+  end
+
   it 'adds offense and corrects when trying to extend a framework class with prepend' do
     expect_offense(<<~RUBY)
       ActiveRecord::Base.prepend(MyClass)