Bug: update_databases.py does not have handling if job ID doesn't exist

[hagertnl]

A cron job running update_databases.py exited this weekend with:

+ update_databases.py --time 3d --user sauetest --machine frontier --loglevel INFO
Enabled 2 database backends
Using machine config: frontier.ini
reading harness config /sw/acceptance/olcf-test-harness-dev/configs/frontier.ini
Traceback (most recent call last):
  File "/sw/acceptance/olcf-test-harness-dev/harness/utilities/update_databases.py", line 291, in <module>
    elif slurm_data[entry['job_id']]['state'] in slurm_job_state_codes['pending']:
KeyError: '2801028'
+ set +x

Now, I suspect that this was due to an issue with sacct that caused the slurm_data dictionary to be empty, but either way, we should be checking if a job ID exists in slurm_data before trying to access it.