Update tokenizer_config.json

https://huggingface.co/Open-Orca/Mistral-7B-OpenOrca/blob/main/special_tokens_map.json

tokenizer_config.json

@@ -49,7 +49,7 @@
   "eos_token": "<|im_end|>",
   "legacy": true,
   "model_max_length": 1000000000000000019884624838656,
-  "pad_token": null,
+  "pad_token": </s>,
   "sp_model_kwargs": {},
   "spaces_between_special_tokens": false,
   "tokenizer_class": "LlamaTokenizer",