OctoRPKI doesn't fall back to snapshot when a delta fails

[carlosm3011]

Hi,

I'm running octorpki for monitoring purposes and I've noticed that it fails to properly handle the situation where one delta cannot be processed (either because a hash mismatch or because it's not available on disk yet).

Both routinator and rpki-client fall back to using the last snapshot. However octorpki rejects the whole TA until a new session is created in the repository or one locally cleans up the cache.

[carlosm3011]

I forgot to mention that I've seen this behaviour accross multiple versions of octorpki.