HPCC-9346 - Slightly improve the 'No active dali' error

Signed-off-by: Jake Smith <jake.smith@lexisnexis.com>
Merge pull request #4732 from jakesmith/hpcc-9346

HPCC-9346 - Slightly improve the 'No active dali' error

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>