core: fix blocks with no zonepath

[Khoyo]

No description provided.

[codecov]

Codecov Report

Merging #3669 (d3634dc) into dev (1d5370c) will increase coverage by 0.01%.
The diff coverage is 30.76%.

@@             Coverage Diff              @@
##                dev    #3669      +/-   ##
============================================
+ Coverage     68.16%   68.18%   +0.01%     
- Complexity     1918     1928      +10     
============================================
  Files           424      424              
  Lines         21394    21498     +104     
  Branches       1555     1573      +18     
============================================
+ Hits          14583    14658      +75     
- Misses         6079     6096      +17     
- Partials        732      744      +12     

Flag	Coverage Δ
core	78.92% <30.76%> (-0.09%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...n/fr/sncf/osrd/sim_infra/impl/BlockInfraBuilder.kt	90.00% <0.00%> (-10.00%)	⬇️
...kotlin/fr/sncf/osrd/signaling/impl/BlockBuilder.kt	70.27% <25.00%> (-3.96%)	⬇️
.../fr/sncf/osrd/sim_infra_adapter/RawInfraAdapter.kt	90.62% <50.00%> (-0.91%)	⬇️

... and 9 files with indirect coverage changes

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