Make model id optional for PySBModel

[dweindl]

If no ID is given, use pysb.Model.name as fallback. As is already the case for SbmlModel and its id attribute.

[dilpath]

👍

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 66.66667% with 2 lines in your changes missing coverage. Please review.

Project coverage is 72.81%. Comparing base (20f77f4) to head (87c253b).

Files with missing lines	Patch %	Lines
petab/v1/models/pysb_model.py	66.66%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #318      +/-   ##
===========================================
- Coverage    72.84%   72.81%   -0.03%     
===========================================
  Files           52       52              
  Lines         4897     4900       +3     
  Branches       838      839       +1     
===========================================
+ Hits          3567     3568       +1     
- Misses        1025     1026       +1     
- Partials       305      306       +1     

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