Fix showing refresh time on public dashboard
Fix showing refresh time on public dashboard

getredash/redash,moritz9/redash,44px/redash,alexanderlz/redash,44px/redash,hudl/redash,chriszs/redash,getredash/redash,hudl/redash,denisov-vlad/redash,alexanderlz/redash,getredash/redash,hudl/redash,44px/redash,moritz9/redash,getredash/redash,moritz9/redash,hudl/redash,moritz9/redash,44px/redash,alexanderlz/redash,denisov-vlad/redash,denisov-vlad/redash,denisov-vlad/redash,chriszs/redash,chriszs/redash,getredash/redash,chriszs/redash,alexanderlz/redash,denisov-vlad/redash