Generate mailer layouts even if no action is given.

railties/lib/rails/generators/erb/mailer/mailer_generator.rb

@@ -9,7 +9,10 @@ def copy_view_files
         view_base_path = File.join("app/views", class_path, file_name)
         empty_directory view_base_path
 
-        layout_base_path = "app/views/layouts"
+        formats.each do |format|
+          layout_path = File.join("app/views/layouts", filename_with_extensions("mailer", format))
+          template filename_with_extensions(:layout, format), layout_path
+        end
 
         actions.each do |action|
           @action = action
@@ -17,9 +20,6 @@ def copy_view_files
           formats.each do |format|
             @path = File.join(view_base_path, filename_with_extensions(action, format))
             template filename_with_extensions(:view, format), @path
-
-            layout_path = File.join(layout_base_path, filename_with_extensions("mailer", format))
-            template filename_with_extensions(:layout, format), layout_path
           end
         end
       end

railties/test/generators/mailer_generator_test.rb

@@ -113,6 +113,8 @@ def test_invokes_default_html_template_engine
   def test_invokes_default_template_engine_even_with_no_action
     run_generator ["notifier"]
     assert_file "app/views/notifier"
+    assert_file "app/views/layouts/mailer.text.erb"
+    assert_file "app/views/layouts/mailer.html.erb"
   end
 
   def test_logs_if_the_template_engine_cannot_be_found