add nullptr after free()

雾聪

2024-01-15 167d74d5982160b6e1819666af5c128ee353ca50

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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