修改，增加非空判断

侯瑞军

2020-04-14 9b38de2269778eea9ef4a138d21e26d726fcecb5

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com\kidgrow\filecenter\service\impl\AbstractIFileService.class
com\kidgrow\filecenter\mapper\FileMapper.class
com\kidgrow\filecenter\util\FileUtil.class
com\kidgrow\filecenter\service\IFileService.class