Fixing Aggregated Objective Visualisations

[arrjon]

Fixes the isses mentioned in #1410 so AggregatedObjective can be used in the visualize.model_fit function.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 65.21739% with 16 lines in your changes missing coverage. Please review.

Project coverage is 83.85%. Comparing base (f183b3c) to head (0f63738).

Files	Patch %	Lines
pypesto/visualize/model_fit.py	64.44%	16 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1411      +/-   ##
===========================================
- Coverage    83.89%   83.85%   -0.05%     
===========================================
  Files          160      160              
  Lines        13067    13096      +29     
===========================================
+ Hits         10963    10982      +19     
- Misses        2104     2114      +10     

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[arrjon]

For the moment I iterate over the objectives in AggregatedObjectives to find all amici models and plot them individually. For the case with only one model and a NegLogPrior objective this works fine.

However, I did not test the function using a petab problem with multiple amici models. Potentially, one needs to extract information from the petab measurement file specific to the corresponding model.

[dweindl]

Thanks.

[Doresic]

Looks good to me! Thanks
Might be good to add a test in test/test_visualize.py testing a case with an aggregated objective (similar to test_visualize_optimized_model_fit() or an extension of it).