funasr_onnx: bare `raise "string"` masks the real exception (TypeError: exceptions must derive from BaseException)

Several error paths in funasr_onnx do raise "some message". That is invalid in Python 3 — a string is not an exception — so the interpreter discards the intended message and raises TypeError: exceptions must derive from BaseException instead.

Combined with the surrounding bare except:, the actual cause is swallowed entirely.

Where

runtime/python/onnxruntime/funasr_onnx/sensevoice_bin.py (current main), lines 50, 54, 66:

try:
    from funasr import AutoModel
except:
    raise "You are exporting onnx, please install funasr and try it again. ..."

The same pattern appears in paraformer_online_bin.py and other *_bin.py files.

What the user sees

File ".../funasr_onnx/sensevoice_bin.py", line 66, in __init__
    raise "You are exporting onnx, please install funasr and try it again..."
TypeError: exceptions must derive from BaseException

What was actually wrong

In my case funasr was installed. The import failed on a missing transitive
dependency:

File ".../funasr/utils/load_utils.py", line 9, in <module>
    import torchaudio
ModuleNotFoundError: No module named 'torchaudio'

The message told me to install a package I already had, while hiding the one I was
missing. Diagnosing it required reading the library source and reproducing the import
by hand.

I hit the same thing a second time on onnxscript (required by newer torch.onnx),
and again when loading a model from a local path — line 54 fires whenever the path
check fails for any reason, so a simple wrong-path mistake also surfaces as
TypeError.

Suggested fix

try:
    from funasr import AutoModel
except ImportError as e:
    raise ImportError(
        "Exporting ONNX requires funasr: pip3 install -U funasr"
    ) from e

raise ... from e keeps the original traceback, so a missing torchaudio stays
visible. Narrowing except: to except ImportError: also stops unrelated failures
from being reported as a missing package.

Happy to send a PR if that would help.

Start with runtime/python/onnxruntime/funasr_onnx/sensevoice_bin.py at the reported lines, then inspect paraformer_online_bin.py and the other *_bin.py files for the same error handling. Check each path that uses a bare except or raises a string, and verify that the original import failure remains visible while unrelated failures are not mislabeled as missing funasr.