Crash when tree not found

[amagnan]

Hello,
I had a crash in this line because I have files that somehow don't have trees inside, and this seems not protected at the moment:

FCCAnalyses/python/process.py

Line 26 in fa672d4

nevents = tt.GetEntries()

I protected it and then it crashed properly later on from the run_fccanalysis.py . I guess it should crash properly here first then...

Also, I have a large signal production with some input parameters from a text file, and some time one of the production fails for different reasons, but I don't really care to use a few points here and there. So, it would be nice that the program does not exit entirely, but simply goes to the next file when one of the input file is not found or the tree does not exist. Or, even better, that there is a flag to decide whether the user wants to exit on this type of errors or not ?

[kjvbrt]

Thanks you @amagnan for the reporting.

This PR should fix the issue: #402

For now it hard stops the execution of the script, let me know if that would not work for you :)