Fix not_in_project scope. Added counters in admin -> users. Improved seeds

db/fixtures/development/006_wall.rb

@@ -1,16 +1,18 @@
 Gitlab::Seeder.quiet do
   (1..300).each  do |i|
     # Random Project
-    project_id = rand(2) + 1
-    project = Project.find(project_id)
+    project = Project.all.sample
 
     # Random user
     user = project.users.sample
+
+    next unless user
+
     user_id = user.id
 
     Note.seed(:id, [{
       id: i,
-      project_id: project_id,
+      project_id: project.id,
       author_id: user_id,
       note: Faker::Lorem.sentence(6)
     }])