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修复当FileRefreshableDataSource文件为空时读取异常

2

### Describe what this PR does / why we need it 在使用FileRefreshableDataSource作为规则数据源时，发现如果初始化空规则文件会导致StringIndexOutOfBoundsException异常 ### Does this pull request fix one issue? ### Describe how you did it 判断规则文件是否有数据 ### Describe how...

修复使用FileRefreshableDataSource作为规则数据源时，初始化空规则文件会导致StringIndexOutOfBoun…

1

…dsException异常 ### Describe what this PR does / why we need it 在使用FileRefreshableDataSource作为规则数据源时，发现如果初始化空规则文件会导致StringIndexOutOfBoundsException异常 ### Does this pull request fix one issue? ### Describe how you did it 判断规则文件是否有数据 ### Describe...