Don't panic when calling cp -a with a nonexistent file #2960
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Fixes #2959 by propagating errors from
preserve_hardlinks()instead of unwrapping them. On Unix platforms,preserve_hardlinks()returns an Error if the file specified bysourcedoes not exist. This was previously causingcp -a abc xyzto panic on Unix if there was no file calledabc. This problem did not occur on Windows.This PR also slightly changes the formatting of the original error to match GNU's output.