- Handle empty script sources
- Fix list-panel groups, order by count

Bug: v8:10644
Change-Id: I03d3915f709d47429040b591c0271e951eca58e9
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3289642
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Auto-Submit: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Patrick Thier <pthier@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78165}