scaling function guardrails

[tjlane]

If crazy data are passed to the scaling function, it can produce np.infs and crash mysteriously. This PR at least catches that and adds a warning message for the user.

Ideally we'd catch outliers and data issues upstream. I feel that's important but can come in a second PR (or multiple PRs). It requires research.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.60%. Comparing base (c49b519) to head (c8f6bb1).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #144      +/-   ##
==========================================
+ Coverage   95.57%   95.60%   +0.02%     
==========================================
  Files          16       16              
  Lines         995     1000       +5     
==========================================
+ Hits          951      956       +5     
  Misses         44       44              

Flag	Coverage Δ
unittests	95.60% <100.00%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.