Fix issue #3404 (empty page regression)
Fix issue #3404 (empty page regression)

The regression was caused by a bug in commit 5db92b26aa4cab45f3da6714328c2fcd80891441.

Signed-off-by: Stefan Weil <8d4c780fcfdc41841e5070f4c43da8958ba6aec0@weilnetz.de>

UB-Mannheim/tesseract,UB-Mannheim/tesseract,amitdo/tesseract,tesseract-ocr/tesseract,UB-Mannheim/tesseract,amitdo/tesseract,tesseract-ocr/tesseract,tesseract-ocr/tesseract,tesseract-ocr/tesseract,amitdo/tesseract,UB-Mannheim/tesseract,amitdo/tesseract,tesseract-ocr/tesseract,stweil/tesseract,amitdo/tesseract,stweil/tesseract,UB-Mannheim/tesseract,stweil/tesseract,stweil/tesseract,stweil/tesseract