I think the problem does not occur anymore in Indigo:

http://help.eclipse.org/indigo/index.jsp?topic=%2Forg.eclipse.jdt.doc.user%2FwhatsNew%2Fjdt_whatsnew.html:

"Missing Javadoc tags for method type parameters no longer reported by default"

I do not see why we should add empty Javadoc tags if not necessary.