bug fix for empty audio

shixian.shi

2023-07-19 2f5d11f8e2802410b0e9a04442d0e40966b46ce6

1
2
3
4
5
6
7
8
9
X    1
XX    2
XXX    3
XL    4
L    5
LX    6
LXX    7
LXXX    8
XC    9