Yield empty records when line can't be normalized
Yield empty records when line can't be normalized

Some spurious (large vertical) lines cause the line normalization to
fail and kraken to abort the recognition process. Skip those and return
empty ocr_records.

QuLogic/ocropy,mittagessen/kraken,mittagessen/kraken,mittagessen/kraken,QuLogic/ocropy,mittagessen/kraken