Solve issue when inserting a point along a non-manifold edge with 2 singular extremities

[Algiane]

Change the return value when BezierNom is called along a non-manifold edge with 2 singular extremities.

If we return 1. The point is inserted along the nom edge but its normals have not been computed (so they can be NaN).

An example of error can be found when running the ls-DisIn-cubegeom-metric-fields-5 test case of ParMmg.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 50.45%. Comparing base (af80663) to head (1e303f8).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #287   +/-   ##
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  Coverage    50.45%   50.45%           
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  Files          177      177           
  Lines        47239    47239           
  Branches     10272    10272           
========================================
+ Hits         23834    23836    +2     
+ Misses       15673    15671    -2     
  Partials      7732     7732           

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[corentin-prigent]

Thanks !