fix paraformer bug, when predicts no token, silence

游雁

2023-01-31 51ea14f910d76c5c1a581098d3808a78fdb9fcd1

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beam_size: 10
penalty: 0.0
maxlenratio: 0.0
minlenratio: 0.0
ctc_weight: 1.0
lm_weight: 0.7