Update generation_config.json

generation_config.json

@@ -1,6 +1,7 @@
 {
   "_from_model_config": true,
   "bos_token_id": 0,
+  "pad_token_id": 0,
   "eos_token_id": 0,
   "transformers_version": "4.39.0.dev0"
 }