An additional fix for https://github.com/pepijn-devries/ggsankeyfier/…

[pepijn-devries]

…issues/23

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.60%. Comparing base (fe8e4f8) to head (f4d3d92).
⚠️ Report is 7 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #25      +/-   ##
==========================================
+ Coverage   93.58%   93.60%   +0.01%     
==========================================
  Files          13       13              
  Lines         499      500       +1     
==========================================
+ Hits          467      468       +1     
  Misses         32       32              

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