FIX 'NoneType' object has no attribute 'isalpha' (#2440)

passerbya

2025-03-20 5ee2f382b32c5c0beaa1c133b466a100c6fb7ebc

 runtime/python/libtorch/demo_paraformer.py

@@ -1,5 +1,5 @@
from pathlib import Path
from funasr_torch import Paraformer
from funasr_torch.paraformer_bin import Paraformer

model_dir = "iic/speech_paraformer-large_asr_nat-zh-cn-16k-common-vocab8404-pytorch"
model = Paraformer(model_dir, batch_size=1)  # cpu