front: fix white screen when opening scenario

[clarani]

closes #5288

[codecov]

Codecov Report

Merging #5289 (3161307) into dev (3cbed1c) will decrease coverage by 0.01%.
Report is 1 commits behind head on dev.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##                dev    #5289      +/-   ##
============================================
- Coverage     18.76%   18.75%   -0.01%     
  Complexity     2318     2318              
============================================
  Files           852      852              
  Lines        103361   103448      +87     
  Branches       2408     2408              
============================================
+ Hits          19395    19403       +8     
- Misses        82628    82707      +79     
  Partials       1338     1338              

Flag	Coverage Δ
front	7.04% <0.00%> (+<0.01%)	⬆️

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Files	Coverage Δ
...s/trainschedule/components/Timetable/Timetable.tsx	0.00% <0.00%> (ø)

... and 6 files with indirect coverage changes