For Forward-Compatibility port reading of RootTreeIndexContainer, MC16d (!37703) · Merge requests · atlas / athena · GitLab

Tadej Novak requested to merge tadej/athena:rtic-mc16d into 21.0-mc16d Oct 28, 2020

Trying to fix ATR-22236.

See merge request !22161 (merged)

(cherry picked from commit 83c1cc15)

/cc @rbielski @mnowak @gemmeren