try fix long update problem

temp_file/playground_controller.rb

@@ -111,7 +111,7 @@ class Admin::PlaygroundController < OrbitAdminController
 				  mul.save
 			  end
 			else
-        render :json => {"alive" => true, "response" => "", "error" => false}.to_json
+        render :json => {"alive" => true, "response" => "finish", "error" => false}.to_json
       end
     end
 	end