Improved handling of missing files for ZDC FADC correction
The new ZDC FADC correction now bails out gracefully, and disables itself, if no calibration file is found.
I also catch the runtime_errors thrown by the FADC and energy configuration methods (which never happened, but were otherwise uncaught).
Duc: I added the link to https://its.cern.ch/jira/browse/ATLASRECTS-8137
Edited by Duc Ta