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

jianganghan

2024-02-29 f272eb4ef78e12a1ef4ae451b114f980a2682d51

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isang    1
dalawang    2
tatlong    3
apat na    4
limang    5
anim na    6
pitong    7
walong    8
siyam na    9