Bnb failling tests (#40026)

* initial commit

* style

---------

Co-authored-by: Yih-Dar <[email protected]>

Author: MekkCyber

src/transformers/quantizers/auto.py

@@ -213,7 +213,10 @@ def merge_quantization_configs(
             else:
                 quantization_config = AutoQuantizationConfig.from_dict(quantization_config)
 
-        if quantization_config.__class__.__name__ != quantization_config_from_args.__class__.__name__:
+        if (
+            quantization_config_from_args is not None
+            and quantization_config.__class__.__name__ != quantization_config_from_args.__class__.__name__
+        ):
             raise ValueError(
                 f"The model is quantized with {quantization_config.__class__.__name__} but you are passing a {quantization_config_from_args.__class__.__name__} config. "
                 "Please make sure to pass the same quantization config class to `from_pretrained` with different loading attributes."