Fix bug which caused crash when all jobs have non-zero exit code
Fix bug which caused crash when all jobs have non-zero exit code e.g. all rawtoall_tier0_reco_data17 jobs in release master fail with exitcode 65 e.g.
cat ~/eos_atlaspmb/archive/custom///2017/master/x86_64-slc6-gcc62-opt/rawtoall_tier0_reco_data17/__exitcode 65 65 ...