fix: prevent table breaking on null columnWidths [ET-161]

[EmilyBonar]

Ticket

Description

Test Plan

• Reset user settings in settings drawer
• select few experiments and open compare view
• click around for a few seconds and make sure you're able to interact with table UI

Checklist

• Changes have been manually QA'd
• User-facing API changes need the "User-facing API Change" label.
• Release notes should be added as a separate file under docs/release-notes/.
  See Release Note for details.
• Licenses should be included for new code which was copied and/or modified from any external code.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 39.53%. Comparing base (d5f807d) to head (399c428).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9131      +/-   ##
==========================================
- Coverage   46.16%   39.53%   -6.64%     
==========================================
  Files        1174      852     -322     
  Lines      145186   105820   -39366     
  Branches     2412     2413       +1     
==========================================
- Hits        67025    41831   -25194     
+ Misses      77953    63781   -14172     
  Partials      208      208              

Flag	Coverage Δ
harness	?
web	36.82% <100.00%> (+<0.01%)	⬆️

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

Files	Coverage Δ
...t/src/pages/F_ExpList/F_ExperimentList.settings.ts	100.00% <100.00%> (ø)

... and 322 files with indirect coverage changes