fixed handling of encoded_image

Author: agrimk

ads/aqua/extension/deployment_handler.py

@@ -396,7 +396,7 @@ def _get_model_deployment_response(
             payload["stop"] = None
 
         encoded_image = "NA"
-        if encoded_image in payload :
+        if "encoded_image" in payload :
             encoded_image = payload["encoded_image"]
 
         model = payload.pop("model")