This is done when all currently pending bugs truly can not be investigated further without feedback from the OP.
look through current "pending" bugs: http://bugs.jquery.com/report/303 , and see if any can be investigated further and rescued to an "open" status without needing more info from OP, and rescue those back from a trac-o-bot fate.
if a ticket can be rescued, attach a valid jsfiddle or jsbin and mark the ticket as open.