DPL: print an error when the configuration is not parsed correctly

[ktf]

This should probably be a fatal error not sure why the rethrown
exception is ignored (and where).

[github-actions]

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[alibuild]

Error while checking build/O2/fullCI_slc9 for 05bb51b at 2025-10-09 11:44:

[2991/4967] Building CXX object Detectors/MUON/Common/CMakeFiles/O2exe-mid-dcs-ccdb.dir/src/dcs-ccdb.cxx.o
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[2994/4967] Linking CXX executable stage/bin/o2-zdc-digi2raw
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[2997/4967] Building CXX object Detectors/MUON/MCH/Calibration/CMakeFiles/O2lib-MCHCalibration.dir/G__O2MCHCalibration.cxx.o
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[3001/4967] Building CXX object Detectors/DCS/CMakeFiles/O2lib-DetectorsDCS.dir/src/GenericFunctions.cxx.o
[3002/4967] Linking CXX shared library stage/lib64/libO2MCHCalibration.so
[3003/4967] Building CXX object Detectors/DCS/CMakeFiles/O2lib-DetectorsDCS.dir/src/DataPointIdentifier.cxx.o
[3004/4967] Linking CXX shared library stage/lib64/libO2FT0Reconstruction.so
[3005/4967] Linking CXX shared library stage/lib64/libO2MIDCalibration.so
[3006/4967] Building CXX object Detectors/DCS/CMakeFiles/O2lib-DetectorsDCS.dir/src/DataPointCreator.cxx.o
[3007/4967] Generating G__O2ZDCRaw.cxx, ../../../stage/lib64/G__O2ZDCRaw_rdict.pcm, ../../../stage/lib64/libO2ZDCRaw.rootmap
[3008/4967] Generating G__O2ZDCReconstruction.cxx, ../../../stage/lib64/G__O2ZDCReconstruction_rdict.pcm, ../../../stage/lib64/libO2ZDCReconstruction.rootmap
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[3011/4967] Building CXX object Detectors/FIT/FV0/workflow/CMakeFiles/O2lib-FV0Workflow.dir/src/RecPointReaderSpec.cxx.o
[3012/4967] Linking CXX executable stage/bin/o2-calibration-mch-badchannel-calib-workflow
[3013/4967] Linking CXX executable stage/bin/o2-ft0-test-raw-conversion
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[3023/4967] Building CXX object Detectors/FIT/FV0/workflow/CMakeFiles/O2exe-fv0-reco-workflow.dir/src/fv0-reco-workflow.cxx.o
[3024/4967] Building CXX object Detectors/FIT/FV0/workflow/CMakeFiles/O2exe-fv0-digits-writer-workflow.dir/src/digits-writer-workflow.cxx.o
[3025/4967] Building CXX object Detectors/ZDC/reconstruction/CMakeFiles/O2lib-ZDCReconstruction.dir/src/BaselineParam.cxx.o
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[3028/4967] Building CXX object Detectors/FIT/FV0/workflow/CMakeFiles/O2exe-fv0-recpoints-writer-workflow.dir/src/recpoints-writer-workflow.cxx.o
[3029/4967] Building CXX object Detectors/FIT/FV0/workflow/CMakeFiles/O2exe-fv0-digit-reader-workflow.dir/src/digits-reader-workflow.cxx.o
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[3032/4967] Linking CXX executable stage/bin/o2-mid-bad-channels-ccdb
[3033/4967] Building CXX object Detectors/ZDC/reconstruction/CMakeFiles/O2lib-ZDCReconstruction.dir/src/DigiParser.cxx.o
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[3036/4967] Building CXX object Detectors/FIT/FV0/workflow/CMakeFiles/O2lib-FV0Workflow.dir/src/RecPointWriterSpec.cxx.o
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[3040/4967] Building CXX object Detectors/FIT/FV0/workflow/CMakeFiles/O2exe-fv0-integrate-cluster-reader-workflow.dir/src/cluster-integrator-reader.cxx.o

Full log here.

[lubynets]

Dear @ktf,
It seems that I found why the exception is ignored: it is effectively silenced here, at least when I catch the std::exception instead of ... and print the std::exception::what(), I see the same error message as here.

From my experience I'd like to say that the current version of exception handling is not optimal, since if the user by mistake leaves one of the Configurable<LabeledArray<double>> fields empty, the code does not crash, but reading the config stops and default version of configuration is used for all the configurables which were not processed yet - i.e. eventually the code does not fail, but calculates something which was not supposed by user, and the user even does not notice that unless they look at dpl-config.json.
I would like to ask if it makes sense to
(1) handle the exception here properly, e.g re-throw it?
or
(2) terminate code with LOG(fatal) here, as you proposed in the PR description? - I think that fatal is an appropriate level of severity, since the user misconfigured the input and running the entire task does not make any sense (?)