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The Etcher CLI displays a nice `Checksum: $checksum` message upon completion. Since the addition of bmap support, a checksum for an image might not be calculated, causing the CLI to display `Checksum: undefined`. This PR takes care of this small UX issue by only showing the checksum message if one indeed exists. Signed-off-by: Juan Cruz Viotti <jviotti@openmailbox.org>