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

TnR2

2025-10-01 528f92f7a2a26cade1c57ccf26b0ba6524e7cae5

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zwanzig    2
dreißig    3
vierzig    4
fünfzig    5
sechzig    6
siebzig    7
achtzig    8
neunzig    9