Missing pedestal tables in some last subruns

[morcuended]

Now and then it happens that last subruns of some runs haven't got the pedestal table, hence dl1ab script fails. When this occurs, OSA discards these files, corresponding to a few seconds of data. Should we try to treat them differently or is it okay that they are discarded?

Traceback (most recent call last):
  File "/fefs/aswg/software/conda/envs/osa-v0.10/bin/lstchain_dl1ab", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/fefs/aswg/software/conda/envs/osa-v0.10/lib/python3.11/site-packages/lstchain/scripts/lstchain_dl1ab.py", line 185, in main
    pedestal_thresh = get_threshold_from_dl1_file(args.input_file, sigma)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/fefs/aswg/software/conda/envs/osa-v0.10/lib/python3.11/site-packages/lstchain/calib/camera/pixel_threshold_estimation.py", line 58, in get_threshold_from_dl1_file
    ped_mean_pe, ped_std_pe = get_bias_and_std(dl1_path)
                              ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/fefs/aswg/software/conda/envs/osa-v0.10/lib/python3.11/site-packages/lstchain/calib/camera/pixel_threshold_estimation.py", line 25, in get_bias_and_std
    ped = f.root[dl1_params_tel_mon_ped_key]
          ~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/fefs/aswg/software/conda/envs/osa-v0.10/lib/python3.11/site-packages/tables/group.py", line 422, in __getitem__
    raise IndexError(childname)
IndexError: /dl1/event/telescope/monitoring/pedestal