Don't generate empty app/views folder when --api and --skip-action-mailer are used together

The purpose of keeping app/views folder in API apps is that it's used for
mailer views so doesn't makes sense to keep it when Action Mailer is skipped.

railties/lib/rails/generators/rails/app/app_generator.rb

@@ -389,9 +389,13 @@ def delete_app_helpers_if_api_option
         end
       end
 
-      def delete_application_layout_file_if_api_option
+      def delete_app_views_if_api_option
         if options[:api]
-          remove_file "app/views/layouts/application.html.erb"
+          if options[:skip_action_mailer]
+            remove_dir "app/views"
+          else
+            remove_file "app/views/layouts/application.html.erb"
+          end
         end
       end
 

railties/test/generators/api_app_generator_test.rb

@@ -63,6 +63,23 @@ def test_generator_if_skip_action_cable_is_given
     end
   end
 
+  def test_generator_if_skip_action_cable_is_given
+    run_generator [destination_root, "--api", "--skip-action-mailer"]
+    assert_file "config/application.rb", /#\s+require\s+["']action_mailer\/railtie["']/
+    assert_file "config/environments/development.rb" do |content|
+      assert_no_match(/config\.action_mailer/, content)
+    end
+    assert_file "config/environments/test.rb" do |content|
+      assert_no_match(/config\.action_mailer/, content)
+    end
+    assert_file "config/environments/production.rb" do |content|
+      assert_no_match(/config\.action_mailer/, content)
+    end
+    assert_no_directory "app/mailers"
+    assert_no_directory "test/mailers"
+    assert_no_directory "app/views"
+  end
+
   def test_app_update_does_not_generate_unnecessary_config_files
     run_generator