Make MemMapFs.Stat("") fail like os.Stat - #652
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os.Stat(\"\") returns a not-exist path error. MemMapFs treated the empty path as a directory, which broke tests that inject Afero in place of the real filesystem. See spf13#522
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Fixes #522
os.Stat(\"\")returns a not-exist path error.MemMapFs.Stat(\"\")succeeded and returned a directory FileInfo with an empty name, so tests that inject Afero in place of the OS filesystem diverged on empty paths.Reject the empty path with
os.ErrNotExistwrapped inos.PathError, matchingos.Stat.