Fix pysb initial condition parsing

[FFroehlich]

No description provided.

[codecov]

Codecov Report

Merging #669 into develop will increase coverage by 0.01%.
The diff coverage is 50%.

@@             Coverage Diff             @@
##           develop     #669      +/-   ##
===========================================
+ Coverage    72.94%   72.96%   +0.01%     
===========================================
  Files           48       48              
  Lines         6975     6976       +1     
===========================================
+ Hits          5088     5090       +2     
+ Misses        1887     1886       -1

Flag	Coverage Δ
#cpp	69.49% <ø> (ø)	⬆️
#python	83.53% <50%> (+0.06%)	⬆️

Impacted Files	Coverage Δ
python/amici/pysb_import.py	91.82% <50%> (+0.03%)	⬆️
python/amici/__init__.py	83.63% <0%> (+1.81%)	⬆️

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