fix mypy

Author: titaiwangms

onnx_diagnostic/torch_models/hghub/model_inputs.py

@@ -113,6 +113,7 @@ def get_untrained_model_with_inputs(
         print(f"[get_untrained_model_with_inputs] architectures={archs!r}")
         print(f"[get_untrained_model_with_inputs] cls={config.__class__.__name__!r}")
     if task is None:
+        assert archs is not None
         task = task_from_arch(archs[0], model_id=model_id, subfolder=subfolder)
     if verbose:
         print(f"[get_untrained_model_with_inputs] task={task!r}")