Trim Reblogs: Silent failure if original root post is deleted

[marcustyphoon]

Platform

MacOS 10.14.6 x86

Browser

Edge 100.0.1185.44

Addon version

0.19.3

Details

Pressing the trim reblogs button on a reblog chain whose original root post has been deleted appears to do nothing; the apiFetch to check shouldOpenInLegacy 404s and the rejected promise kills the callback without anything else happening like notifying the user.

(Apologies if I have some details wrong here; reporting the bug before I forget. May test more carefully later.)