Fix easy rubocop issues

lib/spree/responder.rb

@@ -1,27 +1,39 @@
+# frozen_string_literal: true
+
 module Spree
   class Responder < ::ActionController::Responder #:nodoc:
-
     attr_accessor :on_success, :on_failure
 
-    def initialize(controller, resources, options={})
+    def initialize(controller, resources, options = {})
       super
 
       class_name = controller.class.name.to_sym
       action_name = options.delete(:action_name)
 
-      if result = Spree::BaseController.spree_responders[class_name].try(:[], action_name).try(:[], self.format.to_sym)
-        self.on_success = handler(controller, result, :success)
-        self.on_failure = handler(controller, result, :failure)
-      end
+      result = Spree::BaseController.spree_responders[class_name].
+        try(:[], action_name).
+        try(:[], self.format.to_sym)
+      return unless result
+
+      self.on_success = handler(controller, result, :success)
+      self.on_failure = handler(controller, result, :failure)
     end
 
     def to_html
-      super and return if !(on_success || on_failure)
+      if !(on_success || on_failure)
+        super
+        return
+      end
+
       has_errors? ? controller.instance_exec(&on_failure) : controller.instance_exec(&on_success)
     end
 
     def to_format
-      super and return if !(on_success || on_failure)
+      if !(on_success || on_failure)
+        super
+        return
+      end
+
       has_errors? ? controller.instance_exec(&on_failure) : controller.instance_exec(&on_success)
     end