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… #3575
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…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 how to verify it
加载空的规则文件看是否有异常打印
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