Fix FPE due to log(X) where X <= 0 in jet mass calibration [r22]
This FPE was first seen in r22 (https://its.cern.ch/jira/browse/ATR-23551), but is present in both r21 and r22. The original commit was the r21 fix, but the automatic sweep to r22 failed. This is a manual sweep of the same changes. It looks like the automatic sweep failed because of white-space differences between the r21 and r22 version of the file being modified.
The original r21 MR is !44419 (merged)
Edited by Steven Schramm