fix(chart): fix support for more than 2 parties

[sbckr]

As there are only changes to the tests for the service, it is not mentioned in the commit message to not trigger a new release

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.15%. Comparing base (6707161) to head (01a03a3).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #79   +/-   ##
=========================================
  Coverage     90.15%   90.15%           
  Complexity      397      397           
=========================================
  Files            59       59           
  Lines          1483     1483           
  Branches         78       78           
=========================================
  Hits           1337     1337           
  Misses           93       93           
  Partials         53       53           

Flag	Coverage Δ
service	93.14% <ø> (ø)

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[strieflin]

LGTM

[strieflin]

There one Codacy finding that you could easily address :-).

[strieflin]

LGTM