Exception after clearing cache, the code tries to delete not existing image file

After executing

await DefaultCacheManager().emptyCache();

to clear cache, and immediately refresh images, I get exceptions in the library code trying to delete non existing files.

**I have noticed 3 missing awaits when calling _removeCachedFile in cache_store.dart. Adding the 3 missing awaits solves the issue for me...**

I think missing awaits calling _removeCachedFile produces internal awaits not waiting code execution, and that's the reason exceptions trying to delete non existing files, even if the code checked that the file exists.

Can anybody add the missing awaits in the code please?

检查 cache_store.dart，并找到 issue 中所述的三处 _removeCachedFile 调用。首先跟踪清除缓存和刷新图像的流程，然后通过清除缓存并立即刷新图像来验证行为。报告的异常不再发生即表示完成。

由索引模型根据 Issue 内容生成。