code: def transform_image(self, content_metadata_item):
          
          image_url = ''
          if content_metadata_item['content_type'] in ['course', 'program']:
              image_url = content_metadata_item.get('card_image_url')
          elif content_metadata_item['content_type'] == 'courserun':
              image_url = content_metadata_item.get('image_url')
  
          return image_url
docs: Return the image URI of the content item.