Fix graphql API for fpbase-py

[tlambert03]

fixes tlambert03/microsim#128

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.64%. Comparing base (dbc8e57) to head (4959345).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #400      +/-   ##
==========================================
+ Coverage   62.40%   62.64%   +0.23%     
==========================================
  Files         115      115              
  Lines        9184     9184              
==========================================
+ Hits         5731     5753      +22     
+ Misses       3453     3431      -22     

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