Fix alternative filter

[soininen]

Alternative filter was not dropping parameter values of incomplete multidimensional entities.

No associated issue.

Checklist before merging

• Documentation (also in Toolbox repo) is up-to-date
• Release notes have been updated
• Unit tests have been added/updated accordingly
• Code has been formatted by black & isort
• Unit tests pass

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.38%. Comparing base (1564a61) to head (b98016f).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #469   +/-   ##
=======================================
  Coverage   80.37%   80.38%           
=======================================
  Files          76       77    +1     
  Lines       10025    10030    +5     
  Branches     1477     1477           
=======================================
+ Hits         8058     8063    +5     
  Misses       1625     1625           
  Partials      342      342           

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