Do not ask user to log in in order to log out

Just serve an error on the logout page if there is no valid session,
instead of redirecting to the login workflow.
4 jobs for master in 1 minute and 55 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #6177
test

00:00:23

 
  Build Src
passed #6178
build:src

00:00:14

 
  Build Pkg
passed #6179
build:pkg

00:00:43

 
  Upload
passed #6180
upload:pkg

00:00:34