Realtime visualisation when not logged in

According to feed_controller.php, data.json
(get_data(feedid,start,end,dp)) and timevalue.json
(get_timevalue_seconds(feedid)) are both usable in public or user mode.
By removing the apikey parameter from the 2 data.json requests, the
realtime graph is available with or without being logged in.
It's more comfortable than editing manualy the dashboards to add the
read apikey to make them visible.