fix empty timestamp list inference

shixian.shi

2023-09-06 13c2af5de44d2ac4cb09677ab4fb07f37ade2b98

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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