code: def default_blocks(self):
          
          # Use the block list provided by settings if it's defined
          block_list = getattr(settings, 'GLITTER_DEFAULT_BLOCKS', None)
  
          if block_list is not None:
              return block_list
  
          # Try and auto fill in default blocks if the apps are installed
          block_list = []
  
          for block in GLITTER_FALLBACK_BLOCKS:
              app_name, model_name = block.split('.')
  
              try:
                  model_class = apps.get_model(app_name, model_name)
                  verbose_name = capfirst(model_class._meta.verbose_name)
                  block_list.append((block, verbose_name))
              except LookupError:
                  # Block isn't installed - don't add it as a quick add default
                  pass
  
          return block_list
docs: Return a list of default block tuples (appname.ModelName, verbose name).
  
          Next to the dropdown list of block types, a small number of common blocks which are
          frequently used can be added immediately to a column with one click. This method defines
          the list of default blocks.