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.

This location was missed in #2686.

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.89%. Comparing base (9ea6aef) to head (72d5ead).

Files with missing lines	Patch %	Lines
python/sdist/amici/de_model_components.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2705      +/-   ##
===========================================
- Coverage    77.91%   77.89%   -0.02%     
===========================================
  Files          326      326              
  Lines        23004    23007       +3     
  Branches      1479     1479              
===========================================
- Hits         17924    17922       -2     
- Misses        5069     5074       +5     
  Partials        11       11              

Flag	Coverage Δ
cpp	74.74% <50.00%> (-0.02%)	⬇️
cpp_python	33.57% <50.00%> (-0.01%)	⬇️
petab	39.41% <0.00%> (-0.01%)	⬇️
python	72.94% <50.00%> (-0.02%)	⬇️

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Files with missing lines	Coverage Δ
python/sdist/amici/de_model_components.py	88.53% <50.00%> (-1.08%)	⬇️

... and 3 files with indirect coverage changes

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