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

TnR2

2025-10-01 528f92f7a2a26cade1c57ccf26b0ba6524e7cae5

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십    10
이십    20
삼십    30
사십    40
오십    50
육십    60
칠십    70
팔십    80
구십    90