add message if buffer is null

雾聪

2023-08-24 0b692f69b5c8b6a43765cc6e98d3a259a1fc86f9

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# The conformer transducer decoding configuration from @jeon30c
beam_size: 10
simu_streaming: false
streaming: true
chunk_size: 16
left_context: 16
right_context: 0