Error message is not helpful if huggingface is blocked on a network. #318

Attempting to run semble if access to hugging face is blocked results in the error:

Got: ConnectError: [WinError 10054] An existing connection was forcibly closed by the remote host
An error happened while trying to locate the files on the Hub, and we cannot find the appropriate snapshot folder for the specified revision on the local disk. Please check your internet connection and try again.

It took a bit of digging to figure out what was causing this.

Repro steps:
Block access to hugging face domains and cdns with firewall or hosts file.
Run semble from initial setup.

Error prints giving no clue as to what couldn't be connected to. This was especially concerning at first, given that it claims no external services. Thankfully my initial reaction of WTF was without concern as it's just doing a one time fetch of the model.