Issue when running DisTrk standard analysis over skim_*.root files

[borzari]

Whenever trying to run some of the disappearing tracks standard analysis selection over some of the skim_*.root files, either by simply adding a file in DisappTrks/StandardAnalysis/python/protoConfig_cfg.py or when submitting jobs with osusub, it fails with the following:

ERROR:  The input file appears to be a skim file but no SkimInputTags.json file found in the skim directory.
Input file is /data/users/borzari/condor/BGMC/Run3/2022/WToLNu_2Jets_PostEE/WToLNu_2Jets_PostEE/BasicSelection/skim_0.root
Be sure that you have run mergeOut.py.
----- Begin Fatal Exception 24-Sep-2023 14:56:48 EDT-----------------------
An exception of category 'ConfigFileReadError' occurred while
   [0] Processing the python configuration file named config_2022_cfg.py
Exception Message:
 unknown python problem occurred.
SystemExit: 1

At:
  /share/scratch0/borzari/CMSSW_12_4_11_patch3/python/OSUT3Analysis/Configuration/processingUtilities.py(211): set_skim_tags
  /share/scratch0/borzari/CMSSW_12_4_11_patch3/python/OSUT3Analysis/Configuration/processingUtilities.py(335): add_channels
  /share/scratch0/borzari/CMSSW_12_4_11_patch3/python/DisappTrks/StandardAnalysis/config_cfg.py(22): <module>
  <frozen importlib._bootstrap>(228): _call_with_frames_removed
  <frozen importlib._bootstrap_external>(850): exec_module
  <frozen importlib._bootstrap>(695): _load_unlocked
  <frozen importlib._bootstrap>(986): _find_and_load_unlocked
  <frozen importlib._bootstrap>(1007): _find_and_load
  config_2022_cfg.py(1): <module>

----- End Fatal Exception -------------------------------------------------

This happens when file mergeOut.py was not used. However, this might not always be useful and should be addressed properly. Maybe it can be made that a selection can be applied regardless of mergeOut.py being executed or not.