[BUG]Sentinel控制台新增系统规则提示失败

[guonanjun]

Issue Description

Type: bug report

Describe what happened (or what feature you want)

Sentinel控制台新增系统规则提示失败

Describe what you expected to happen

期望在没有系统规则时，可以新增系统规则成功。

Tell us your environment

任何环境

[sczyh30]

Thanks for reporting! We'll fix this .