fix #316

[bart1]

Makes it possible to calculate new attributes for a ppi

[codecov-commenter]

Codecov Report

Merging #458 (9a1edbd) into master (6b22288) will decrease coverage by 0.16%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #458      +/-   ##
==========================================
- Coverage   43.47%   43.31%   -0.17%     
==========================================
  Files          53       53              
  Lines        2919     2930      +11     
==========================================
  Hits         1269     1269              
- Misses       1650     1661      +11     

Impacted Files	Coverage Δ
R/calculate_param.R	0.00% <0.00%> (ø)

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