Fix nan in Minuit

[PFLeget]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 91.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 87.42%. Comparing base (1c6fee4) to head (55b39bd).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
treegp/two_pcf.py	91.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #32      +/-   ##
==========================================
- Coverage   87.51%   87.42%   -0.10%     
==========================================
  Files           8        8              
  Lines         801      803       +2     
==========================================
+ Hits          701      702       +1     
- Misses        100      101       +1     

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