Merge branch 'fj-fixed-bug-17054' into 'master'

Fixed bug with the user synced attributes when the user doesn't exist

See merge request gitlab-org/gitlab-ce!17152

lib/gitlab/o_auth/user.rb

@@ -224,7 +224,7 @@ module Gitlab
       end
 
       def clear_user_synced_attributes_metadata
-        gl_user.user_synced_attributes_metadata&.destroy
+        gl_user&.user_synced_attributes_metadata&.destroy
       end
 
       def log