Update otter.py

[marouenbg]

To address this issue: netZoo/netZooR#341

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 58.25%. Comparing base (b6d05b7) to head (83b1bca).
Report is 36 commits behind head on devel.

Files with missing lines	Patch %	Lines
netZooPy/otter/otter.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            devel     #359      +/-   ##
==========================================
+ Coverage   57.06%   58.25%   +1.18%     
==========================================
  Files          39       41       +2     
  Lines        2518     2848     +330     
==========================================
+ Hits         1437     1659     +222     
- Misses       1081     1189     +108     

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[violafanfani]

Good. Thank you!