When grouping, do not display the tag name if the value is the empty string.
When grouping, do not display the tag name if the value is the empty string.

at15/kairosdb-1,panqingcui/kairosdb-1,george-aprozeanu/kairosdb,deejay1/kairosdb,ppbizapps/kairosdb,kairosdb/kairosdb,kairosdb/kairosdb,rdettai/kairosdb,at15/kairosdb-1,pawellesniewski/kairosdb,panqingcui/kairosdb-1,rdettai/kairosdb,pawellesniewski/kairosdb,wangtuanjie/kairosdb,lgscofield/kairosdb,at15/kairosdb-1,ppbizapps/kairosdb,panqingcui/kairosdb-1,rdettai/kairosdb,lgscofield/kairosdb,wangtuanjie/kairosdb,george-aprozeanu/kairosdb,deejay1/kairosdb,rdettai/kairosdb,george-aprozeanu/kairosdb,kairosdb/kairosdb,pawellesniewski/kairosdb,lgscofield/kairosdb,panqingcui/kairosdb-1,kairosdb/kairosdb,at15/kairosdb-1,at15/kairosdb-1,pawellesniewski/kairosdb,ppbizapps/kairosdb,george-aprozeanu/kairosdb,lgscofield/kairosdb,wangtuanjie/kairosdb,kairosdb/kairosdb,lgscofield/kairosdb,deejay1/kairosdb,wangtuanjie/kairosdb,kairosdb/kairosdb,deejay1/kairosdb,rdettai/kairosdb,wangtuanjie/kairosdb,panqingcui/kairosdb-1,deejay1/kairosdb,george-aprozeanu/kairosdb,pawellesniewski/kairosdb,ppbizapps/kairosdb,ppbizapps/kairosdb