Running `torchchat export` with just the model name does not error out

[malfet]

🐛 Describe the bug

Running python torchchat.py export stories15M does not error out, nor generates any export files, though it should have?

% python torchchat.py export stories15M; echo $?
lm_eval is not installed, GPTQ may not be usable
Using device=mps
Warning! Device MPS not supported for export. Exporting for device CPU.
Loading model...
Time to load model: 0.02 seconds
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Versions

No idea, where is the torchchat version defined?