Unwrap panic in Zenoh Storage Manager Plugin

[chachi]

Describe the bug

2024-02-26 13:59:43.860           zenohd thread 'async-std/runtime' panicked at plugins/zenoh-plugin-storage-manager/src/replica/digest.rs:296:58:
2024-02-26 13:59:43.860           zenohd called `Option::unwrap()` on a `None` value
2024-02-26 13:59:43.860           zenohd note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace```

### To reproduce

1. Start a router
2. Attach a storage to the router via the adminspace that is replicating from another router

### System info

* Zenoh 0.10.1-rc
* Crashing router is on an NVIDIA Xavier, Ubuntu 18.04
* Non-crashing router is on an x86_64 EC2 instance

[Charles-Schleich]

Hi @chachi,

Thank you for opening this up and bringing it to our attention.
We have planned for tomorrow a large API review,
and it is one of my personal goals to push for time to removal of .unwrap()'s and .expect()'s from the code base
and properly handle invariant's.

I am looking into this issue in the mean time,
and I will try to get a NVIDIA Xavier to reproduce the issue.