fix: helpful JS providing non string types

[pauldambra]

follow up to #21127

turns out it wasn't (only) nullish values but rather that when we json parse the error we might not get strings in response

in this case I saw JSON parse returning an error object

so, now we wrap this in a catch, report a title we can't parse, and ensure it's a string before trimming it

[github-actions]

Size Change: 0 B

Total Size: 824 kB

ℹ️ View Unchanged

Filename	Size
frontend/dist/toolbar.js	824 kB

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