Sweeping !38299 from master to 21.2. Fix bug in txt to ROOT file conversion for lightGBM training for MVAUtils (!38366) · Merge requests · atlas / athena · GitLab

Atlas Nightlybuild requested to merge cherry-pick-aebbde5b0bf-21.2 into 21.2 Nov 18, 2020

Fix bug in txt to ROOT file conversion for lightGBM training for MVAUtils

See merge request !38299 (merged)