If remote file isn't present in repo we will add it anyway to the files list and check `if len(files) == 0 {` never will be true. That leads to missing section with `MissingFileHandler`.
That fix check that cloned file actually exists. In that case if we add a link to non-existing remote file `MissingFileHandler` will be called as expected.
Signed-off-by: Vladimir Kuznichenkov <kuzaxak.tech@gmail.com>
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