fix single word case (#1679)

彭震东

2024-04-29 1f49a4f2b2744c30fcbfff6fbb85d6133c6203f2

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from fun_text_processing.text_normalization.en.taggers.tokenize_and_classify import ClassifyFst
from fun_text_processing.text_normalization.en.verbalizers.verbalize import VerbalizeFst
from fun_text_processing.text_normalization.en.verbalizers.verbalize_final import VerbalizeFinalFst