🐛 [#2508] Fix hotfix for non-business login tab-panel

[jiromaykin]

issue: https://taiga.maykinmedia.nl/project/open-inwoner/issue/2508

Test: http://localhost:8000/accounts/login/

If 'zakelijk'/eHerkenning is turned off, then there will be no tab-headers visible, which means no tab-panel Nodes should be rendered

fixing the console error:

Uncaught TypeError: Cannot read properties of null (reading 'addEventListener')
    at new TabPanel (open_inwoner-js.js:4704:24)
    at open_inwoner-js.js:4805:10 ...
    ...

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.12%. Comparing base (0002256) to head (cd6ebe6).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1312   +/-   ##
========================================
  Coverage    95.12%   95.12%           
========================================
  Files          983      983           
  Lines        35727    35727           
========================================
  Hits         33985    33985           
  Misses        1742     1742           

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