layoutlmv3-base-chinese tokenizer could not be loaded.
### System Info

```
File ~/anaconda3/envs/paddle_env/lib/python3.8/site-packages/transformers/models/layoutlmv3/tokenization_layoutlmv3.py:325, in LayoutLMv3Tokenizer.__init__(self, vocab_file, merges_file, errors, bos_token, eos_token, sep_token, cls_token, unk_token, pad_token, mask_token, add_prefix_space, cls_token_box, sep_token_box, pad_token_box, pad_token_label, only_label_first_subword, **kwargs)
    305 mask_token = AddedToken(mask_token, lstrip=True, rstrip=False) if isinstance(mask_token, str) else mask_token
    307 super().__init__(
    308     errors=errors,
    309     bos_token=bos_token,
   (...)
    322     **kwargs,
    323 )
--> 325 with open(vocab_file, encoding="utf-8") as vocab_handle:
    326     self.encoder = json.load(vocab_handle)
    327 self.decoder = {v: k for k, v in self.encoder.items()}

TypeError: expected str, bytes or os.PathLike object, not NoneType

```





### Who can help?

_No response_

### Information

- [ ] The official example scripts
- [ ] My own modified scripts

### Tasks

- [ ] An officially supported task in the `examples` folder (such as GLUE/SQuAD, ...)
- [ ] My own task or dataset (give details below)

### Reproduction

none

### Expected behavior

```
from transformers import AutoProcessor, AutoModel, XLMRobertaTokenizer, LayoutLMv3
chinese_processor = AutoProcessor.from_pretrained("./layoutlmv3_base_chinese", apply_ocr=False, local_files_only=True) 
```
But we seem need vocab.json and merges.txt to load the LayoutLMv3Tokenizer .
So  could you provide a function to convert them or confirm whether there is a diff between these two tokenizers?
The same problem, can you please solve it<|||||>**The problem still exists.**

processor = AutoProcessor.from_pretrained("microsoft/layoutlmv3-base", apply_ocr=False)
It can run successfully，fail to load "microsoft/layoutlmv3-base-chinese", such as: 
processor = AutoProcessor.from_pretrained("microsoft/layoutlmv3-base-chinese", apply_ocr=False)

TypeError: expected str, bytes or os.PathLike object, not NoneType


Version: 4.22.0.dev0
Summary: State-of-the-art Machine Learning for JAX, PyTorch and TensorFlow
Home-page: https://github.com/huggingface/transformers
Author: The Hugging Face team (past and future) with the help of all our contributors <|||||>As far as I know, transformers doesn't support chinese layoultlmv3,  but unilm is OK.
https://github.com/microsoft/unilm/tree/master/layoutlmv3<|||||>> As far as I know, transformers doesn't support chinese layoultlmv3, but unilm is OK. https://github.com/microsoft/unilm/tree/master/layoutlmv3

But I see it also requires vocab.json and merges.txt. I cannot load tokenizer either.
https://github.com/microsoft/unilm/blob/master/layoutlmv3/layoutlmft/models/layoutlmv3/tokenization_layoutlmv3.py

![1663659780(1)](https://user-images.githubusercontent.com/29231853/191197738-3eee84fe-57c2-47b6-ab43-1a91ea2fb823.png)

How did you solve it, please?