Was causing panics when trying to access kopia stats. Panic was recovered from, but reading the error was difficult.
Add some CLI tests to hopefully stop future regressions for this specific case
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#### Does this PR need a docs update or release note?
- [x] ✅ Yes, it's included
- [ ] 🕐 Yes, but in a later PR
- [ ] ⛔ No
#### Type of change
- [ ] 🌻 Feature
- [x] 🐛 Bugfix
- [ ] 🗺️ Documentation
- [ ] 🤖 Test
- [ ] 💻 CI/Deployment
- [ ] 🧹 Tech Debt/Cleanup
#### Issue(s)
* closes#2668
#### Test Plan
- [x] 💪 Manual
- [ ] ⚡ Unit test
- [x] 💚 E2E