Refactor inspect method to use object instead of hash

Author: fcce

lib/grape_entity/entity.rb

@@ -472,8 +472,8 @@ def presented
 
     # Prevent default serialization of :options or :delegator.
     def inspect
-      hash = serializable_hash
-      if hash.nil?
+      object = serializable_hash
+      if object.nil?
         "#<#{self.class.name}:#{object_id}> nil"
       else
         fields = object.map { |k, v| "#{k}=#{v}" }