old_contents: #
  # Copyright (c) 2015 Red Hat
  # Licensed under The MIT License (MIT)
  # http://opensource.org/licenses/MIT
  #
  from django.apps import AppConfig
  from pdc.apps.utils.utils import connect_app_models_pre_save_signal
  
  
  class TreeConfig(AppConfig):
      name = 'pdc.apps.tree'
  
      def ready(self):
          connect_app_models_pre_save_signal(self)
  
new_contents: #
  # Copyright (c) 2015 Red Hat
  # Licensed under The MIT License (MIT)
  # http://opensource.org/licenses/MIT
  #
  from django.apps import AppConfig
  
  
  class TreeConfig(AppConfig):
      name = 'pdc.apps.tree'
  
      def ready(self):
          from pdc.apps.utils.utils import connect_app_models_pre_save_signal
          connect_app_models_pre_save_signal(self)
  
subject: Fix app loading in django 1.9 like in #419.