HPCC-10517 Fix Package subfile nodes sometimes added to DALI as empty

Signed-off-by: Anthony Fishbeck <anthony.fishbeck@lexisnexis.com>
Merge pull request #5269 from afishbeck/emptyPackageSubfileNodes

HPCC-10517 Fix Package subfile nodes sometimes added to DALI as empty

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>