BUG: Fix an issue with parsing multiple ligands in generate_psf2

[BvB93]

cc @RobertaPascazio

[codecov]

Codecov Report

Merging #282 (3a8117d) into master (a952a71) will decrease coverage by 3.25%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master     #282      +/-   ##
==========================================
- Coverage   74.90%   71.64%   -3.26%     
==========================================
  Files          65       65              
  Lines        7096     7093       -3     
  Branches     1367     1368       +1     
==========================================
- Hits         5315     5082     -233     
- Misses       1440     1687     +247     
+ Partials      341      324      -17     

Impacted Files	Coverage Δ
FOX/recipes/psf.py	37.50% <0.00%> (-44.47%)	⬇️
FOX/functions/molecule_utils.py	92.51% <50.00%> (-2.59%)	⬇️
FOX/recipes/similarity.py	32.55% <0.00%> (-67.45%)	⬇️
FOX/recipes/param.py	57.73% <0.00%> (-17.53%)	⬇️
FOX/logger.py	73.52% <0.00%> (-10.30%)	⬇️
FOX/armc/package_manager.py	63.51% <0.00%> (-9.02%)	⬇️
FOX/armc/armc_pt.py	78.51% <0.00%> (-6.62%)	⬇️
FOX/armc/monte_carlo.py	75.00% <0.00%> (-4.10%)	⬇️
FOX/properties/base.py	84.00% <0.00%> (-3.00%)	⬇️
... and 5 more

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