Jonas Jenwald 29af15f37e Add more validation in the PDFDocument._hasOnlyDocumentSignatures method
If this method is ever passed invalid/unexpected data, or if during the course of parsing (since it's used recursively) such data is found, it will fail in a non-graceful way.
Hence this patch, which ensures that we don't attempt to access non-existent properties and also that errors such as the one fixed in PR 12479 wouldn't have occured.
2020-10-16 13:03:47 +02:00
..
2012-10-29 14:08:52 -04:00