ISF_FastCaloSimEvent: Improve error reporting.

If we fail to open a data file, print the path we tried to open.

This merge request affects 1 package:

• Simulation/ISF/ISF_FastCaloSim/ISF_FastCaloSimEvent

This merge request affects 1 file:

• Simulation/ISF/ISF_FastCaloSim/ISF_FastCaloSimEvent/src/TFCSPredictExtrapWeights.cxx

Adding @zhangr ,@schaarsc ,@tadej ,@jbeirer ,@jchapman as watchers

added Simulation main review-pending-level-1 labels

CI Result SUCCESS (hash ca7d659a)

	Athena
externals
cmake
make
tests

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Athena: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 7311] (remote access info)

added review-approved label and removed review-pending-level-1 label

merged

mentioned in commit 4b14a6ad