add update_averages call to importers missing it

[struan]

Some importers were not calculating an average value which meant there was no default value when a filter was selected.

Fixes #327

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7d0ec5d) 82.30% compared to head (7808b54) 82.24%.
Report is 1 commits behind head on main.

❗ Current head 7808b54 differs from pull request most recent head e342cea. Consider uploading reports for the commit e342cea to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #356      +/-   ##
==========================================
- Coverage   82.30%   82.24%   -0.07%     
==========================================
  Files          87       87              
  Lines        2645     2636       -9     
  Branches      276      275       -1     
==========================================
- Hits         2177     2168       -9     
  Misses        404      404              
  Partials       64       64              

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