Cherry pick !74561 to 24.0

This includes some useful changes that @xju put into main. They should have gone to 24.0 but we missed this before it was merged.

Original

Add a check of zero tracks to the FTAG GNN

See merge request !74561 (merged)

(cherry picked from commit 5aba2f55)

fb9dada9 fix the zero tracks efed5c6d add optional check 1324e856 fix a comparision bug 53782603 dan's comments 763a3373 fix 2f7a686e Merge branch 'atlas_main' into xju_fix_ftag_zero_track

Co-authored-by: Frank Winklmeier frank.winklmeier@cern.ch