exit when send all data for python ws client (#627)

zhaomingwork

2023-06-13 38ccf84873508eb0153b5213b387cd20ce775a1b

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