Fixing GM_KPP in the presence of pandas DF

[pedrovma]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 18.75000% with 13 lines in your changes missing coverage. Please review.

Project coverage is 66.1%. Comparing base (3ff33bc) to head (3b2fc63).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
spreg/sp_panels.py	20.0%	12 Missing ⚠️
spreg/dgp.py	0.0%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #170     +/-   ##
=======================================
- Coverage   66.2%   66.1%   -0.1%     
=======================================
  Files         44      44             
  Lines      10986   11001     +15     
=======================================
+ Hits        7270    7273      +3     
- Misses      3716    3728     +12     

Files with missing lines	Coverage Δ
spreg/dgp.py	9.3% <0.0%> (ø)
spreg/sp_panels.py	84.8% <20.0%> (-6.0%)	⬇️