refactoring: simplify code

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[codecov]

Codecov Report

Attention: Patch coverage is 98.36830% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 97.36%. Comparing base (fb3e174) to head (f419c81).
Report is 1 commits behind head on master.

Files	Patch %	Lines
trafilatura/baseline.py	95.00%	3 Missing ⚠️
trafilatura/core.py	98.51%	2 Missing ⚠️
trafilatura/external.py	97.67%	1 Missing ⚠️
trafilatura/xml.py	98.27%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #543      +/-   ##
==========================================
+ Coverage   97.26%   97.36%   +0.09%     
==========================================
  Files          22       23       +1     
  Lines        3438     3414      -24     
==========================================
- Hits         3344     3324      -20     
+ Misses         94       90       -4     

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