fix the issue of hotwords_embedding potentially being a null pointer

雾聪

2023-11-16 74cf8b65b2254eee059f6f599bb6095db5c66001

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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