Fix editoast train schedule deserialization error message

[flomonster]

No description provided.

[shenriotpro]

Thanks

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.49%. Comparing base (ee75b28) to head (255618e).

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Additional details and impacted files

@@              Coverage Diff              @@
##                dev    #7334       +/-   ##
=============================================
+ Coverage     29.09%   87.49%   +58.39%     
=============================================
  Files          1137       31     -1106     
  Lines        139639     1535   -138104     
  Branches       2757        0     -2757     
=============================================
- Hits          40626     1343    -39283     
+ Misses        97404      192    -97212     
+ Partials       1609        0     -1609     

Flag	Coverage Δ
core	?
editoast	?
front	?
gateway	?
railjson_generator	87.49% <ø> (ø)
tests	?

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