Fix dynamic model getattr for `MPDataDoc

[munrojm]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 80.48% and project coverage change: -0.42 ⚠️

Comparison is base (98eb360) 81.05% compared to head (f445782) 80.63%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #764      +/-   ##
==========================================
- Coverage   81.05%   80.63%   -0.42%     
==========================================
  Files          36       36              
  Lines        1758     1782      +24     
==========================================
+ Hits         1425     1437      +12     
- Misses        333      345      +12     

Impacted Files	Coverage Δ
mp_api/client/routes/alloys.py	52.63% <25.00%> (-6.20%)	⬇️
mp_api/client/core/client.py	89.21% <75.00%> (+0.02%)	⬆️
mp_api/client/routes/thermo.py	92.42% <85.71%> (-5.45%)	⬇️
mp_api/client/core/settings.py	92.00% <100.00%> (+0.33%)	⬆️
mp_api/client/mprester.py	58.91% <100.00%> (+0.11%)	⬆️

... and 2 files with indirect coverage changes

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