front: fix itinerary marker not always defined

[theocrsb]

closes #10414

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.92%. Comparing base (ece353f) to head (1802311).
Report is 25 commits behind head on dev.

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #10770      +/-   ##
==========================================
- Coverage   81.93%   81.92%   -0.01%     
==========================================
  Files        1084     1084              
  Lines      107212   107216       +4     
  Branches      737      737              
==========================================
  Hits        87842    87842              
- Misses      19329    19333       +4     
  Partials       41       41              

Flag	Coverage Δ
editoast	74.37% <ø> (-0.02%)	⬇️
front	89.49% <100.00%> (+<0.01%)	⬆️
gateway	2.18% <ø> (ø)
osrdyne	3.28% <ø> (ø)
railjson_generator	87.58% <ø> (ø)
tests	87.91% <ø> (ø)

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[Math-R]

Sorry but the bug still occure here it's a footage

Enregistrement.de.l.ecran.2025-02-13.a.11.21.07.mov

[axrolld]

@Math-R i think when there's no pathfinding we should not display the small cards with the tracks, only the pins with numbers 1, 2, 3, etc. @theocrsb agrees with that.

[theocrsb]

I just pushed with the modifications

[Akctarus]

Tested and lgtm ! I find it much cleaner and easier to understand

[Math-R]

Okay till the comportement as been discuss, it looks good to me