fix: handle empty strings after event removal in transcription processing (...

TnR2

2025-10-01 528f92f7a2a26cade1c57ccf26b0ba6524e7cae5

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一    12
二    1
三    2
四    3
五    4
六    5
七    6
八    7
九    8
十    9
十一    10
十二    11