old_contents: from appconf import AppConf
  from django.conf import settings
  
  
  class ImageKitConf(AppConf):
      CACHEFILE_NAMER = 'imagekit.cachefiles.namers.hash'
      SPEC_CACHEFILE_NAMER = 'imagekit.cachefiles.namers.source_name_as_path'
      CACHEFILE_DIR = 'CACHE/images'
      DEFAULT_CACHEFILE_BACKEND = 'imagekit.cachefiles.backends.Simple'
      DEFAULT_CACHEFILE_STRATEGY = 'imagekit.cachefiles.strategies.JustInTime'
  
      DEFAULT_FILE_STORAGE = None
  
      CACHE_BACKEND = None
      CACHE_PREFIX = 'imagekit:'
      USE_MEMCACHED_SAFE_CACHE_KEY = True
  
      def configure_cache_backend(self, value):
          if value is None:
              try:
                  from django.core.cache.backends.dummy import DummyCache
              except ImportError:
                  dummy_cache = 'dummy://'
              else:
                  dummy_cache = 'django.core.cache.backends.dummy.DummyCache'
  
              if settings.DEBUG:
                  value = dummy_cache
              else:
                  value = (
                      getattr(settings, 'CACHES', {}).get('default')
                      or getattr(settings, 'CACHE_BACKEND', None)
                      or dummy_cache
                  )
          return value
  
      def configure_default_file_storage(self, value):
          if value is None:
              value = settings.DEFAULT_FILE_STORAGE
          return value
  
new_contents: from appconf import AppConf
  from django.conf import settings
  
  
  class ImageKitConf(AppConf):
      CACHEFILE_NAMER = 'imagekit.cachefiles.namers.hash'
      SPEC_CACHEFILE_NAMER = 'imagekit.cachefiles.namers.source_name_as_path'
      CACHEFILE_DIR = 'CACHE/images'
      DEFAULT_CACHEFILE_BACKEND = 'imagekit.cachefiles.backends.Simple'
      DEFAULT_CACHEFILE_STRATEGY = 'imagekit.cachefiles.strategies.JustInTime'
  
      DEFAULT_FILE_STORAGE = None
  
      CACHE_BACKEND = None
      CACHE_PREFIX = 'imagekit:'
      USE_MEMCACHED_SAFE_CACHE_KEY = True
  
      def configure_cache_backend(self, value):
          if value is None:
              try:
                  from django.core.cache.backends.dummy import DummyCache
              except ImportError:
                  dummy_cache = 'dummy://'
              else:
                  dummy_cache = 'django.core.cache.backends.dummy.DummyCache'
  
              # DEFAULT_CACHE_ALIAS doesn't exist in Django<=1.2
              try:
                  from django.core.cache import DEFAULT_CACHE_ALIAS as default_cache_alias
              except ImportError:
                  default_cache_alias = 'default'
  
              if settings.DEBUG:
                  value = dummy_cache
              elif default_cache_alias in getattr(settings, 'CACHES', {}):
                  value = default_cache_alias
              else:
                  value = getattr(settings, 'CACHE_BACKEND', None) or dummy_cache
  
          return value
  
      def configure_default_file_storage(self, value):
          if value is None:
              value = settings.DEFAULT_FILE_STORAGE
          return value
  
subject: Fix cache backend fallback