Fixed generic model multiple deploy. (#309)

Author: lu-ohai

ads/model/generic_model.py

@@ -2151,7 +2151,7 @@ def deploy(
                 "log_id", None
             )
             or self.properties.deployment_predict_log_id,
-            deployment_image = existing_runtime.image
+            deployment_image = getattr(existing_runtime, "image", None)
             or self.properties.deployment_image,
             deployment_instance_subnet_id = existing_infrastructure.subnet_id
             or self.properties.deployment_instance_subnet_id
@@ -2229,16 +2229,24 @@ def deploy(
         runtime = None
         if self.properties.deployment_image:
             image_digest = (
-                kwargs.pop("image_digest", None) or existing_runtime.image_digest
+                kwargs.pop("image_digest", None) 
+                or getattr(existing_runtime, "image_digest", None)
+            )
+            cmd = (
+                kwargs.pop("cmd", []) 
+                or getattr(existing_runtime, "cmd", [])
+            )
+            entrypoint = (
+                kwargs.pop("entrypoint", [])
+                or getattr(existing_runtime, "entrypoint", [])
             )
-            cmd = kwargs.pop("cmd", []) or existing_runtime.cmd
-            entrypoint = kwargs.pop("entrypoint", []) or existing_runtime.entrypoint
             server_port = (
-                kwargs.pop("server_port", None) or existing_runtime.server_port
+                kwargs.pop("server_port", None) 
+                or getattr(existing_runtime, "server_port", None)
             )
             health_check_port = (
                 kwargs.pop("health_check_port", None)
-                or existing_runtime.health_check_port
+                or getattr(existing_runtime, "health_check_port", None)
             )
             runtime = (
                 ModelDeploymentContainerRuntime()