front: fix no data display when no train in timetable in op studies

[RomainValls]

closes #5468

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 28.35%. Comparing base (829deba) to head (f7fe5d6).
Report is 1 commits behind head on dev.

Files	Patch %	Lines
...ons/operationalStudies/views/SimulationResults.tsx	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #6765      +/-   ##
============================================
- Coverage     28.35%   28.35%   -0.01%     
  Complexity     2177     2177              
============================================
  Files          1047     1047              
  Lines        129455   129453       -2     
  Branches       2576     2576              
============================================
- Hits          36707    36703       -4     
- Misses        91260    91262       +2     
  Partials       1488     1488              

Flag	Coverage Δ
core	79.39% <ø> (ø)
editoast	75.93% <ø> (-0.02%)	⬇️
front	8.61% <0.00%> (+<0.01%)	⬆️
gateway	2.50% <ø> (ø)
railjson_generator	87.26% <ø> (ø)
tests	83.07% <ø> (ø)

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[Caracol3]

lgtm

[Math-R]

lgtm