Patch pulse_apparition_time if not a parameter

[Kev1CO]

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This change is 

[codecov]

Codecov Report

Attention: Patch coverage is 72.72727% with 12 lines in your changes are missing coverage. Please review.

Project coverage is 87.26%. Comparing base (050e41d) to head (f450ac0).
Report is 1 commits behind head on main.

Files	Patch %	Lines
cocofest/optimization/fes_ocp_dynamics.py	9.09%	10 Missing ⚠️
cocofest/optimization/fes_ocp.py	81.81%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #62      +/-   ##
==========================================
- Coverage   87.70%   87.26%   -0.45%     
==========================================
  Files          23       23              
  Lines        2099     2104       +5     
==========================================
- Hits         1841     1836       -5     
- Misses        258      268      +10     

Flag	Coverage Δ
unittests	87.26% <72.72%> (-0.45%)	⬇️

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