Improve status of dummy job
When no jO are added the dummy job will report success.
When jO are added but no
log.generate.short files are provided the dummy job will give a warning.
With no jO
Check https://gitlab.cern.ch/atlas-physics/pmg/mcjoboptions/-/jobs/18096337 and the eventual status of this MR
With jO and no log.generate.short file
Closes #153 (closed)