Generate dummy athena job if no log.generate.short files are found

Description of bug

As seen in !873 (merged) if there are no log.generate.short files found there will be no real athena jobs and due to the change introduced in !872 (merged) there would also be no dummy jobs to run in the child pipeline so the pipeline would fail.

Changes introduced

Check if any real athena job was created and if not create a dummy one.

Tests

Pull from !873 (merged) and it should succeed.

Issues resolved

Closes #