Fixes a small issue for Firefox 115.4.0esr

Sascha Eggenbergerrequested to merge
empty-panel-fallback-old-browsers into master

What does this MR do and why?

A small fix for the [unsupported] Firefox 115.4.0esr version as of a recent release. Adds an :empty fallback to make GitLab usable again for the impacted users.

Screenshots or screen recordings

Before After
Firefox 115.4.0esr (unsupported, broken)
esr115_before esr115_after
Firefox 140.15.0esr (working)
esr140_before esr140_after

How to set up and validate locally

  1. Go to any page with a panel, e.g. https://gdk.test:3000/flightjs/Flight

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Closes #627827 (closed)

Edited by Sascha Eggenberger

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