FAST: Increase optional values by 1 if no operator is applied

Optional values (NULL-able values) should be amended before
transferring. It was done for all cases except one by some
accident. The patch fixes this case.

Signed-off-by: Marat Stanichenko <mstanichenko@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>