Fix two bugs for blank voice (empty speech): (#1403)

jianganghan

2024-02-29 f272eb4ef78e12a1ef4ae451b114f980a2682d51

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[*.{js,jsx,ts,tsx,vue}]
charset = utf-8
indent_style = space
indent_size = 4
end_of_line = lf
trim_trailing_whitespace = true
insert_final_newline = true