Export of XWikiPreferences page fails

This is a non critical issue but the XWikiPreferences page fails to export to PDF

The following exception occurs:

Error number 11015 in 11: Exception while exporting
Wrapped Exception: Error number 12002 in 12: Exception while exporting
PDF
Wrapped Exception: org.apache.fop.fo.ValidationException: null:30:90:
Error(30/90): fo:list-block is missing child elements.
Required Content Model: marker* (list-item)+
com.xpn.xwiki.XWikiException: Error number 11015 in 11: Exception while
exporting
Wrapped Exception: Error number 12002 in 12: Exception while exporting
PDF
Wrapped Exception: org.apache.fop.fo.ValidationException: null:30:90:
Error(30/90): fo:list-block is missing child elements.
Required Content Model: marker* (list-item)+
at com.xpn.xwiki.web.ExportAction.render(ExportAction.java:64)
at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:216)
at com.xpn.xwiki.web.XWikiAction.execute(XWiki

We might be able to fix this in 2.0 syntax. Otherwise it's not so important except that the menu is there and that people might to the PDF export.