old_contents: from django.core.checks import Error, register
  
  # the sole purpose of this warning is to prevent people who have
  # django-autocomplete-light installed but not configured to start the app
  @register()
  def dal_check(app_configs, **kwargs):
      from django.conf import settings
      from todo.features import HAS_AUTOCOMPLETE
  
      if not HAS_AUTOCOMPLETE:
          return
  
      errors = []
      missing_apps = {'dal', 'dal_select2'} - set(settings.INSTALLED_APPS)
      for missing_app in missing_apps:
          errors.append(
              Error('{} needs to be in INSTALLED_APPS'.format(missing_app))
          )
      return errors
  
new_contents: from django.core.checks import Error, register
  
  # the sole purpose of this warning is to prevent people who have
  # django-autocomplete-light installed but not configured to start the app
  @register()
  def dal_check(app_configs, **kwargs):
      from django.conf import settings
      from todo.features import HAS_AUTOCOMPLETE
  
      if not HAS_AUTOCOMPLETE:
          return []
  
      errors = []
      missing_apps = {'dal', 'dal_select2'} - set(settings.INSTALLED_APPS)
      for missing_app in missing_apps:
          errors.append(
              Error('{} needs to be in INSTALLED_APPS'.format(missing_app))
          )
      return errors
  
subject: Fix dal_check integrity error when autocomplete not enabled