rockscache v0.0.8，TagAsDeleted 调用Lua报错

[kong9527]

在官方示例项目dtm-cases中，将项目启动起来，浏览器输入：http://localhost:8081/api/busi/atomic?mode=dtm，测试报错，提示：
ERR Error running script (call to f_551fcfca51cfb60a31372a5725cc8866a19a89c1): @user_script:2: WRONGTYPE Operation against a key holding the wrong kind of value

[dej4vu]

在官方示例项目dtm-cases中，将项目启动起来，浏览器输入：http://localhost:8081/api/busi/atomic?mode=dtm，测试报错，提示： ERR Error running script (call to f_551fcfca51cfb60a31372a5725cc8866a19a89c1): @user_script:2: WRONGTYPE Operation against a key holding the wrong kind of value

修改上述两处代码，因为前后逻辑有冲突