Sweeping !24861 from master to 21.9. Explicitly check the validity of the objects before asking for their elements in diff_root_files.py (!24930) · Merge requests · atlas / athena

Explicitly check the validity of the objects before asking for their elements in diff_root_files.py

See merge request !24861 (merged)

Sweeping !24861 from master to 21.9. Explicitly check the validity of the objects before asking for their elements in diff_root_files.py