Fix unhandled exception with broken symlink in directory #4735
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Fixes #4714.
Dereferencing a symlink with
path.realpathraises an exception if it the symlink is broken, but the exception is never rescued, causing a 0 byte zip.However, #4715 introduced
-L(--dereference), which will attempt to dereference all symlinks, which exits with exit code 1 if it encounters broken symlinks. This fixes the error handling logic fordu, although I'm not 100% sure if there are cases whereduexits with 1 and it is actually an error we do not want to attempt to parse the result of.