Comment 2 for bug 1687310

Note there is still a (damaged) PDF being written, which looks like this:

%PDF-1.3
%âãÏÓ
1 0 obj
<<
/Type /Catalog
/Metadata 2 0 R
/MarkInfo << /Marked true >>
/StructTreeRoot 8 0 R
/Pages 3 0 R
>>
endobj

2 0 obj
<<
/Type /Metadata
/Subtype /XML
/Length 711
>>
stream
<?xpacket begin="" id="W5M0MpCehiHzreSzNTczkc9d"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
         xmlns:xmp="http://ns.adobe.com/xap/1.0/">
  <rdf:Description rdf:about=""
                   xmlns:pdfaid="http://www.aiim.org/pdfa/ns/id/"
                   xmlns:xmp="http://ns.adobe.com/xap/1.0/">
    <pdfaid:part>1</pdfaid:part>
    <pdfaid:conformance>A</pdfaid:conformance>
    <xmp:CreatorTool>Simple Scan 3.24.1</xmp:CreatorTool>
    <xmp:CreateDate>2017-04-30T20:52:20+02:00</xmp:CreateDate>
    <xmp:ModifyDate>2017-04-30T20:52:20+02:00</xmp:ModifyDate>
    <xmp:MetadataDate>2017-04-30T20:52:20+02:00</xmp:MetadataDate>
  </rdf:Description>
</rdf:RDF>
<?xpacket end="w"?>
endstream
endobj

3 0 obj
<<
/Type /Pages
/Kids [ 5 0 R ]
/Count 1
>>
endobj