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图片URL为空字符串时请求异常,这样在性能监测的过程中会出现无效的URL
![573ed2db-055f-48ca-92b0-4e6068381d17](https://user-images.githubusercontent.com/2938251/33307284-ed2953b4-d450-11e7-82ef-82bef4e2ba87.png)