SBML import: Handle unsolvable event triggers

[dweindl]

Not all event trigger functions can be solved for time when trying to compute the trigger time. Handle sympy errors in that case.

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 77.81%. Comparing base (ec55af6) to head (856be2e).

Files with missing lines	Patch %	Lines
python/sdist/amici/sbml_import.py	60.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2686      +/-   ##
===========================================
- Coverage    77.86%   77.81%   -0.05%     
===========================================
  Files          332      332              
  Lines        22995    23000       +5     
  Branches      1480     1480              
===========================================
- Hits         17905    17898       -7     
- Misses        5079     5091      +12     
  Partials        11       11              

Flag	Coverage Δ
cpp	74.75% <60.00%> (-0.05%)	⬇️
cpp_python	33.61% <0.00%> (-0.01%)	⬇️
petab	39.41% <0.00%> (-0.02%)	⬇️
python	72.85% <60.00%> (-0.04%)	⬇️

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Files with missing lines	Coverage Δ
python/sdist/amici/sbml_import.py	79.32% <60.00%> (-0.10%)	⬇️

... and 3 files with indirect coverage changes

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