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

TnR2

2025-10-01 528f92f7a2a26cade1c57ccf26b0ba6524e7cae5

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十    10
十一    11
十二    12
十三    13
十四    14
十五    15
十六    16
十七    17
十八    18
十九    19