Fix: Return tuple ('', []) when char_list is empty to prevent ValueError (#...

lingji-yidong

2024-06-28 c880db53646ab9fd26417f4baf004ab44cc24e1a

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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