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Iustin Pop authored
This removes: - the check in backend that such OSes have a variants file or if it exists that is non-empty; in order for this to work, we also rework the logic in backend._TryOSFromDisk to allow for optional OS files - the check in cluster verify such OSes to have a non-empty variant list (the check for consistent variants is still kept) Signed-off-by: Iustin Pop <iustin@google.com> Reviewed-by: Michael Hanselmann <hansmi@google.com>
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