Ahh, we recently added a step to pet loading that sends a metadata
request to `PetService.getPet`, which is now (in a sense, correctly!)
raising a `PetNotFound` error when we try modeling with a "pet" that
starts with `@` (a trick we use in situations where we can get an image
hash for a modeling situation, but not an irl pet itself).
In this change, we make it no longer a crashing issue if the pet
metadata request fails: it's not a big deal to have a `PetType` have no
image hash or not have it be up-to-date!
In the next change, I'll also add an optimization to skip fetching it
altogether in this case—but I wanted to see this work first, because
the more general resilience is more important imo!