docs: def autodiscover_media_extensions():
      """
      Auto-discover INSTALLED_APPS media_extensions.py modules and fail silently when
      not present. This forces an import on them to register any media extension bits
      they may want.
  
      Rip of django.contrib.admin.autodiscover()
      """
      import copy
      from django.conf import settings
      from django.utils.module_loading import module_has_submodule
  
      for app in settings.INSTALLED_APPS:
          mod = import_module(app)
          try:
              import_module('%s.media_extension' % app)
          except:
              if module_has_submodule(mod, 'media_extension'):
                  raise