[fix] fix empty asr result (#1794)

Xingchen Song(宋星辰)

2024-06-07 93a02feda1848531a48a1794a8de12a962c84a8e

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ID0012W0013 https://isv-data.oss-cn-hangzhou.aliyuncs.com/ics/MaaS/ASR/test_audio/asr_example_zh.wav
ID0012W0014 https://isv-data.oss-cn-hangzhou.aliyuncs.com/ics/MaaS/ASR/test_audio/asr_example_en.wav