add message if buffer is null

雾聪

2023-08-24 0b692f69b5c8b6a43765cc6e98d3a259a1fc86f9

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