slapos_panel: Only render status gadget related instance is found

3 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
passed SlapOS-Master.UnitTest-Master

01:55:14

passed SlapOS.Eggs.UnitTest-Master.Python2

00:22:56

failed SlapOS.Eggs.UnitTest-Master.Python3

00:21:32