Flb/fix to pylint2.15.4

[francescalb]

Description:

Pylint 2.15.4 introduced some new tests that were not followed.
The code has been updated accordingly.

Type of change:

• Bug fix.
• New feature.
• Documentation update.

Checklist:

This checklist can be used as a help for the reviewer.

• Is the code easy to read and understand?
• Are comments for humans to read, not computers to disregard?
• Does a new feature has an accompanying new test (in the CI or unit testing schemes)?
• Has the documentation been updated as necessary?
• Does this close the issue?
• Is the change limited to the issue?
• Are errors handled for all outcomes?
• Does the new feature provide new restrictions on dependencies, and if so is this documented?

Comments:

[jesper-friis]

Looks good. You should only remove some leftover debugging statements

[codecov-commenter]

Codecov Report

Merging #535 (3a0464c) into master (751a8d5) will increase coverage by 0.01%.
The diff coverage is 60.00%.

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@@            Coverage Diff             @@
##           master     #535      +/-   ##
==========================================
+ Coverage   65.58%   65.59%   +0.01%     
==========================================
  Files          16       16              
  Lines        3089     3090       +1     
==========================================
+ Hits         2026     2027       +1     
  Misses       1063     1063              

Impacted Files	Coverage Δ
ontopy/graph.py	61.63% <0.00%> (ø)
ontopy/ontology.py	70.27% <33.33%> (ø)
ontopy/patch.py	54.96% <50.00%> (+0.34%)	⬆️
ontopy/ontodoc.py	66.33% <100.00%> (ø)

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[CasperWA]

Did you want to update the pylint requirements as well, by the way?

Edit: Never mind - I now saw your comment in the issue :)