extract.py: fix list block for empty lists

[mb03]

In case there is a listblock with no elements, by accident or design, the current code would raise an error.
This fix solves the case of empty list.

[zerolab]

Nice catch, @mb03
Can you please lint the code and add a test for this too?

You can see #510 or #525 for examples of tests for it

[mb03]

Linted and added a test

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.25%. Comparing base (af6746d) to head (ce9a627).
Report is 295 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #545      +/-   ##
==========================================
+ Coverage   91.22%   91.25%   +0.03%     
==========================================
  Files          37       37              
  Lines        3235     3235              
  Branches      522      522              
==========================================
+ Hits         2951     2952       +1     
  Misses        163      163              
+ Partials      121      120       -1     

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[zerolab]

Merged, thank you