keep blank for english asr result (#623)

zhaomingwork

2023-06-13 4a33f08defa92ac6c9c757dbde06d29d183bf203

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beam_size: 5
penalty: 0.0
maxlenratio: 0.0
minlenratio: 0.0
ctc_weight: 0.5
lm_weight: 0.7