## Description
Report an error if an item in details that was sourced from a base snapshot doesn't have a previous path. Items that don't have a previous path cannot be sourced from a base snapshot's backup details meaning the item will be stored but will not be searchable/restorable by users
Logging was not used because no context is available in the kopia callback that is checking if the previous path is nil
## Does this PR need a docs update or release note?
- [ ] ✅ Yes, it's included
- [ ] 🕐 Yes, but in a later PR
- [x] ⛔ No
## Type of change
- [ ] 🌻 Feature
- [x] 🐛 Bugfix
- [ ] 🗺️ Documentation
- [ ] 🤖 Test
- [ ] 💻 CI/Deployment
- [ ] 🧹 Tech Debt/Cleanup
## Issue(s)
* closes#1915
## Test Plan
- [ ] 💪 Manual
- [x] ⚡ Unit test
- [ ] 💚 E2E