[fix] better solution for handling empty result (#1796)

Xingchen Song(宋星辰)

2024-06-11 0bd1a4d6a9893e45438505514a063d9deee91f21

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