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

jianganghan

2024-02-29 f272eb4ef78e12a1ef4ae451b114f980a2682d51

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dalawampu't    2
tatlumpu't    3
apatnapu't    4
limampu't    5
animnapu't    6
pitumpu't    7
walumpu't    8
siyamnapu't    9