keep empty speech result (#1772)

彭震东

2024-05-30 a64b7d8d8aeb2bb543ca703045a45f42470e9a63

1
2
3
4
5
6
7
8
9
c    1
cc    2
ccc    3
cd    4
d    5
dc    6
dcc    7
dccc    8
cm    9