sending an empty directory produces a BLAKE3 hazmat assertion failure #87
Description
This is with sendme--version 0.25.0. In one terminal:
$ cd `mktemp -d`
$ sendme send .
...
In another:
$ sendme receive ...
getting collection 321465e756fab26fd96d9a252ca91111d9674e5cbb8756c79173c5cb3e5c9a0e 1 files, 1.52 MiB
[3/3] Downloading 3 blob(s)
⠁ [00:00:00] [-------------------------------------------------------------------------------------] 0 B/1.52 MiB 0 B/s
thread 'main' panicked at /home/jacko/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/blake3-1.8.1/src/hazmat.rs:237:9:
assertion `left != right` failed: empty subtrees are never valid
left: 0
right: 0