Do not print data to terminal when output file is given.
Do not print data to terminal when output file is given.

This brings --read-data-object behavior in line with
--read-certificate, which only print the object to
stdout if no output file is given.

Signed-off-by: Nuno Goncalves <54df356d35a1227da7b6a150655996586549b9d2@gmail.com>

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