Moved conditional from #post_process_styles to #process_style? method

lib/paperclip/attachment.rb

@@ -427,9 +427,9 @@ def post_process(*style_args) #:nodoc:
     end
 
     def post_process_styles(*style_args) #:nodoc:
-      post_process_style(:original, styles[:original]) if styles.include?(:original) && (style_args.empty? || style_args.include?(:original))
+      post_process_style(:original, styles[:original]) if styles.include?(:original) && process_style?(:original, style_args)
       styles.reject{ |name, style| name == :original }.each do |name, style|
-        post_process_style(name, style) if style_args.empty? || style_args.include?(name)
+        post_process_style(name, style) if process_style?(name, style_args)
       end
     end
 
@@ -445,6 +445,10 @@ def post_process_style(name, style) #:nodoc:
       end
     end
 
+    def process_style?(style_name, style_args) #:nodoc:
+      style_args.empty? || style_args.include?(style_name)
+    end
+
     def interpolate(pattern, style_name = default_style) #:nodoc:
       interpolator.interpolate(pattern, self, style_name)
     end