Fix "ArgumentError: tried to create Proc object without a block"

Author: philippthun

lib/fog/aliyun/requests/storage/get_object.rb

@@ -30,7 +30,7 @@ def get_object(bucket_name, object_name, options = {}, &block)
           end
 
           if block_given?
-            http_options[:response_block] = Proc.new
+            http_options[:response_block] = Proc.new {}
           end
 
           resources = {