Set teachers grade to 'no student anymore' on first oauth login

5 jobs for master in 16 minutes and 49 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Test
passed clippy #1168

00:03:33

passed test #1167

00:04:10

 
  Build
passed build #1170

00:04:14

passed documentation #1169

00:03:36

 
  Testdeploy
passed testdeploy #1171

00:01:14