bug fix for empty audio

shixian.shi

2023-07-19 2f5d11f8e2802410b0e9a04442d0e40966b46ce6

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beam_size: 10
penalty: 0.0
maxlenratio: 0.0
minlenratio: 0.0
ctc_weight: 0.5
lm_weight: 0.7