classes: bundle: Add exists check before copying hook file
classes: bundle: Add exists check before copying hook file

Signed-off-by: Marcel Hellwig <64b2b6d12bfe4baae7dad3d018f8cbf6b0e7a044@cookiesoft.de>

rauc/meta-rauc,rauc/meta-rauc,rauc/meta-rauc,rauc/meta-rauc