only show waterfall link if waterfall summary is configured
only show waterfall link if waterfall summary is configured

sitespeedio/sitespeed.io,sitespeedio/sitespeed.io,beenanner/sitespeed.io,JeroenVdb/sitespeed.io,sitespeedio/sitespeed.io,JeroenVdb/sitespeed.io,beenanner/sitespeed.io,JeroenVdb/sitespeed.io,sitespeedio/sitespeed.io,beenanner/sitespeed.io