pdfunite: Check XRef's Catalog for being a Dict
This is the "easy" way mentioned in #706 (comment 99000).
It just checks whether Catalog from XRef is Dict for each document passed to pdfunite and return error if not.
This is the "easy" way mentioned in #706 (comment 99000).
It just checks whether Catalog from XRef is Dict for each document passed to pdfunite and return error if not.