Update document_writer.py

[M-JULIANI]

Related Issues

• fixes psycopg.DataError: PostgreSQL text fields cannot contain NUL (0x00) bytes haystack-core-integrations#751

Proposed Changes:

Guarding against writing null byes in /components/document_writer.py

How did you test it?

Manually, it allows the pipeline to write the parsed text from pdf to my postgres db.

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[masci]

@M-JULIANI thanks for the PR but I don't think this is the right place for the fix, this would always remove the null character for any data passing through a document writer, I can totally see how this might be a problem if you need that character on different types of document. I would probably do this in a pre-processor, like DocumentCleaner.