Fix: avoid empty module set when inspecting the type annotations

[superstar54]

This PR makes sure all the modules set to be imported are not empty.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 76.01%. Comparing base (5937b88) to head (da6519d).
Report is 20 commits behind head on main.

Files	Patch %	Lines
tests/test_python.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #220      +/-   ##
==========================================
+ Coverage   75.75%   76.01%   +0.26%     
==========================================
  Files          70       70              
  Lines        4615     4904     +289     
==========================================
+ Hits         3496     3728     +232     
- Misses       1119     1176      +57     

Flag	Coverage Δ
python-3.11	75.89% <83.33%> (+0.23%)	⬆️
python-3.12	75.91% <83.33%> (?)
python-3.9	75.96% <83.33%> (+0.23%)	⬆️

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