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

passerbya

2025-03-20 5ee2f382b32c5c0beaa1c133b466a100c6fb7ebc

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from fun_text_processing.inverse_text_normalization.zh.taggers.tokenize_and_classify import (
    ClassifyFst,
)
from fun_text_processing.inverse_text_normalization.zh.verbalizers.verbalize import VerbalizeFst
from fun_text_processing.inverse_text_normalization.zh.verbalizers.verbalize_final import (
    VerbalizeFinalFst,
)