provide a undefined/null speed limit when user provide empty field

[kmer2016]

fix the first problem of this issue

The problem was that the way we converted the values entered in Speed limit field returned 0 when the field was left empty.

How to test ?

• On Infra Editor, load an infra
• Open Speed limit tool (
• add some Speed limit with empty key/value
• save and check on network tab of devtools that the payload of the request POST on url http://localhost:4000/api/infra/4/ replace empty speed limit by undefined/null

[codecov]

Codecov Report

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (e5390a5) 27.71% compared to head (4c0a4f4) 22.73%.

Files	Patch %	Lines
...tor/tools/rangeEdition/speedSection/SpeedInput.tsx	0.00%	5 Missing ⚠️
...eEdition/speedSection/SpeedSectionMetadataForm.tsx	0.00%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #6428      +/-   ##
============================================
- Coverage     27.71%   22.73%   -4.98%     
============================================
  Files          1003      694     -309     
  Lines        126630   115343   -11287     
  Branches       2580      808    -1772     
============================================
- Hits          35093    26223    -8870     
+ Misses        90047    88316    -1731     
+ Partials       1490      804     -686     

Flag	Coverage Δ
core	?
editoast	75.46% <ø> (+<0.01%)	⬆️
front	8.36% <0.00%> (-0.01%)	⬇️
gateway	2.50% <ø> (ø)
railjson_generator	87.44% <ø> (ø)
tests	81.95% <ø> (ø)

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[Akctarus]

Tested, LGTM

[flomonster]

Tested and it works 🎉.

[SharglutDev]

Lgtm and tested. As specified by @Yohh, the key issue demands more work and will be fixed in a different PR