fix bug in asr_inference_paraformer_vad_punc and support without punc model

lzr265946

2023-02-08 5db5950e0735783a8b1c3b5278868b75dd8556a7

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from fun_text_processing.inverse_text_normalization.id.graph_utils import GraphFst
 
 
class FractionFst(GraphFst):
    """
    Finite state transducer for verbalizing fraction, 
    """
 
    def __init__(self):
        super().__init__(name="fraction", kind="verbalize")