integ test edits

Author: Bryannah Hernandez

src/sagemaker/serve/model_server/multi_model_server/server.py

@@ -130,14 +130,15 @@ def _upload_server_artifacts(
             }
         }
 
-        env_vars = {
-            "SAGEMAKER_SUBMIT_DIRECTORY": "/opt/ml/model/code",
-            "SAGEMAKER_PROGRAM": "inference.py",
-            "SAGEMAKER_SERVE_SECRET_KEY": secret_key,
-            "SAGEMAKER_REGION": sagemaker_session.boto_region_name,
-            "SAGEMAKER_CONTAINER_LOG_LEVEL": "10",
-            "LOCAL_PYTHON": platform.python_version(),
-        }
+        if secret_key:
+            env_vars = {
+                "SAGEMAKER_SUBMIT_DIRECTORY": "/opt/ml/model/code",
+                "SAGEMAKER_PROGRAM": "inference.py",
+                "SAGEMAKER_SERVE_SECRET_KEY": secret_key,
+                "SAGEMAKER_REGION": sagemaker_session.boto_region_name,
+                "SAGEMAKER_CONTAINER_LOG_LEVEL": "10",
+                "LOCAL_PYTHON": platform.python_version(),
+            }
 
         return model_data, _update_env_vars(env_vars)