HPCC-11549 Always report a missing OPT file as information

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
Merge pull request #6113 from ghalliday/issue11549

HPCC-11549 Always report a missing OPT file as information

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>