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TEMPORARY Workaround for missing b-tagging inputs (ATLASRECTS-5027)

Dan Guest requested to merge dguest/athena:workaround-for-ATLASRECTS-5027 into 21.2

We seem to have aux variables from JetFitter missing in some events. It's not clear why these are ever missing, but the code that consumes them was throwing exceptions when it tried to retrieve them. This catches the exceptions and prints a warning.

Some more specifics:

  • this is a temporary workaround that should be resolved in the next three months
  • this is only used in the FTAG1, FTAG2, and FTAG4
  • this only affects flip taggers, which are only used for specific calibrations, but the bug keeps the FTAG derivations from running completely
  • this adds a new decoration, and this will need to be added to the FTAG derivations before being able to use the flip taggers. this will happen in a separate merge request
Edited by Nils Erik Krumnack

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