You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: 20210921112300_issue_3751_missing_workflow_screens.rb
    path of file: ./repos/zammad/db/migrate
    
    the code of the file until where you have to start completion: # Copyright (C) 2012-2024 Zammad Foundation, https://zammad-foundation.org/

class Issue3751MissingWorkflowScreens < ActiveRecord::Migration[6.0]
  def change
    return if !Setting.exists?(name: 'system_init_done')

    fix_organization_screen
    
  def fix_organization_screens_create
    %w[name shared domain_assignment active].each do |name|
      field = ObjectManager::Attribute.find_by(name: name, object_lookup: ObjectLookup.find_by(name: 'Organization'))
      next if field.blank?

      field.screens['create'] ||= {}
      field.screens['create']['-all-'] ||= {}
      field.screens['create']['-all-']['null'] = false
      field.save
    end
  end