fix empty timestamp list inference

shixian.shi

2023-09-06 13c2af5de44d2ac4cb09677ab4fb07f37ade2b98

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