… is now fault tolerant as well. Includes tests.

Fixes: #5633

Auditors: @jonathansampson, @bbondy

Manual test plan:
1. Move your session out of the way (or do a fresh install)
2. Launch Brave
3. Go to about:brave
4. Notice version shows as expected

Automated test plan:
run `npm run test -- --grep="about:brave tests"`