Account for both ModelCard and ModelPackageModelCard objects

Author: bobbywlindsey

sagemaker-core/src/sagemaker/core/model_registry.py

@@ -12,6 +12,7 @@
     MODEL_PACKAGE_INFERENCE_SPECIFICATION_CONTAINERS_PATH,
     MODEL_PACKAGE_VALIDATION_PROFILES_PATH,
 )
+from sagemaker.core.resources import ModelPackageModelCard
 from botocore.exceptions import ClientError
 import logging
 
@@ -101,7 +102,10 @@ def get_model_package_args(
         model_package_args["model_life_cycle"] = model_life_cycle._to_request_dict()
     if model_card is not None:
         original_req = {}
-        original_req["ModelCardContent"] = model_card.content
+        if isinstance(model_card, ModelPackageModelCard):
+             original_req["ModelCardContent"] = model_card.model_card_content
+        else:
+             original_req["ModelCardContent"] = model_card.content
         original_req["ModelCardStatus"] = model_card.model_card_status
         model_package_args["model_card"] = original_req
     return model_package_args