add checks that files for output streams are opened successfully
This shouldn't happen very often, but now it will at least abort the job straight away.
Edited by Nils Erik Krumnack
Please be advised that registry.cern.ch registry (Registry Service) will be unavailable next Monday, March 10th starting at 08:00h (Geneva time) for a short period of time. This may cause temporary disruptions to your workflows. Further information: OTG0154905
This shouldn't happen very often, but now it will at least abort the job straight away.