Fix skipping of jobs with external LHE files in run_athena
Description of bug
Wrong if statement in run_athena.sh
was causing an unwanted behaviour where jobs with external LHE files were not being skipped: https://gitlab.cern.ch/atlas-physics/pmg/mcjoboptions/-/jobs/9797183#L25
Changes introduced
Fix bash if statement
Tests
Local test using jO from !646 (merged)
Issues resolved
Closes #
Edited by Spyros Argyropoulos