osrdyne: exit if the provided configuration file doesn't exist

[leovalais]

Yaml::file_exact fails if the path doesn't point to a file.
Yaml::file does not (by design).

Yet another "what is wrong with my setup again?" and its just osrdyne.yml instead of osrdyne.yaml...

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 37.18%. Comparing base (91021c9) to head (390e639).
Report is 1 commits behind head on dev.

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Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #9144      +/-   ##
============================================
- Coverage     37.19%   37.18%   -0.01%     
  Complexity     2242     2242              
============================================
  Files          1263     1263              
  Lines        116087   116087              
  Branches       3278     3278              
============================================
- Hits          43174    43169       -5     
- Misses        70959    70964       +5     
  Partials       1954     1954              

Flag	Coverage Δ
core	74.80% <ø> (ø)
editoast	72.31% <ø> (-0.02%)	⬇️
front	15.29% <ø> (ø)
gateway	2.22% <ø> (ø)
osrdyne	2.56% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	86.46% <ø> (ø)

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[Khoyo]

But I am appalled that Yaml::file_exact() panics instead of reporting an error...

[leovalais]

It does not panic but since the error is propagated up to the main() invocation the result is just like a panic. I reworded the commit as I can see how misleading the description was...