🐛 Fix AuthorsUsersSeparationUpdater

It was creating authors for users without mods.

lib/authors_users_separation_updater.rb

@@ -1,13 +1,16 @@
 class AuthorsUsersSeparationUpdater
   def run
     User.all.each do |user|
-      author = Author.create! name: user.name, forum_name: user.name
-      AuthorsMod.where(author_id: user.id).update_all(author_id: author.id)
-      if user.autogenerated?
-        user.destroy!
-      elsif author.mods.where(owner: user).count > 0
-        author.user = user
-        author.save!
+      authors_mods = AuthorsMod.where(author_id: user.id)
+      unless authors_mods.empty?
+        author = Author.create! name: user.name, forum_name: user.name
+        authors_mods.update_all(author_id: author.id)
+        if user.autogenerated?
+          user.destroy!
+        elsif author.mods.where(owner: user).count > 0
+          author.user = user
+          author.save!
+        end
       end
     end
   end

spec/lib/authors_users_separation_updater_spec.rb

@@ -102,6 +102,12 @@ describe AuthorsUsersSeparationUpdater do
     expect(User.find_by_id u2.id).to eq u2
   end
 
+  it "should not create an author for a user that doesn't have any associated mod" do
+    create :user, name: 'Potato'
+    updater.run
+    expect(Author.all).to be_empty
+  end
+
   it 'should associate the user and the author if the user is owner of the mod' do
     u1 = create :user, name: 'Potato'
     u2 = create :user, name: 'Galaxy'