On https://www.postgresql.org/docs/manuals/ we print an empty <ul> block in
case there is no PDF version available for the release, which violates XHTML
where <ul> requires at least one <li> item. Attached patch wraps the list
generation in checks for a4/letter PDFs, and omits <ul> in case no PDF is
available. Another option would be to have a dummy <li> with “No PDF
available” or something like that, I personally prefer to leave it blank
though.
cheers ./daniel
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