Older datasets throwing safety errors with 2.21.0

### Describe the bug

The dataset loading was throwing some safety errors for this popular dataset `wmt14`. 

[in]:

```
import datasets

# train_data = datasets.load_dataset("wmt14", "de-en", split="train")
train_data = datasets.load_dataset("wmt14", "de-en", split="train")
val_data = datasets.load_dataset("wmt14", "de-en", split="validation[:10%]")
```


[out]:

```
---------------------------------------------------------------------------
KeyError                                  Traceback (most recent call last)
[<ipython-input-9-445f0ecc4817>](https://localhost:8080/#) in <cell line: 4>()
      2 
      3 # train_data = datasets.load_dataset("wmt14", "de-en", split="train")
----> 4 train_data = datasets.load_dataset("wmt14", "de-en", split="train")
      5 val_data = datasets.load_dataset("wmt14", "de-en", split="validation[:10%]")

12 frames
[/usr/local/lib/python3.10/dist-packages/huggingface_hub/hf_api.py](https://localhost:8080/#) in __init__(self, **kwargs)
    636         if security is not None:
    637             security = BlobSecurityInfo(
--> 638                 safe=security["safe"], av_scan=security["avScan"], pickle_import_scan=security["pickleImportScan"]
    639             )
    640         self.security = security

KeyError: 'safe'
```


### Steps to reproduce the bug

See above.

### Expected behavior

Dataset properly loaded.

### Environment info

version: 2.21.0

Comments:
I am also getting this error with this dataset: https://huggingface.co/datasets/google/IFEval

Me too, didn't have this issue few hours ago.

same observation. I even downgraded `datasets==2.20.0` and `huggingface_hub==0.23.5` leading me to believe it's an issue on the server.

any known workarounds?


Not a good idea, but commenting out the whole security block at `/usr/local/lib/python3.10/dist-packages/huggingface_hub/hf_api.py` is a temporary workaround:

```
        #security = kwargs.pop("security", None)
        #if security is not None:
        #    security = BlobSecurityInfo(
        #        safe=security["safe"], av_scan=security["avScan"], pickle_import_scan=security["pickleImportScan"]
        #    )
        #self.security = security
```


Uploading a dataset  to Huggingface also results in the following error in the Dataset Preview:
```
The full dataset viewer is not available (click to read why). Only showing a preview of the rows.
'safe'
Error code:   UnexpectedError
Need help to make the dataset viewer work? Make sure to review [how to configure the dataset viewer](link1), and [open a discussion](link2) for direct support.
```
I used jsonl format for the dataset in this case. Same exact dataset worked previously.

Same issue here. Even reverting to older version of `datasets` (e.g., `2.19.0`) results in same error:

```python
>>> datasets.load_dataset('allenai/ai2_arc', 'ARC-Easy')

File "/Users/lucas/miniforge3/envs/oe-eval-internal/lib/python3.10/site-packages/huggingface_hub/hf_api.py", line 3048, in <listcomp>
    RepoFile(**path_info) if path_info["type"] == "file" else RepoFolder(**path_info)
  File "/Users/lucas/miniforge3/envs/oe-eval-internal/lib/python3.10/site-packages/huggingface_hub/hf_api.py", line 534, in __init__
    safe=security["safe"], av_scan=security["avScan"], pickle_import_scan=security["pickleImportScan"]
KeyError: 'safe'
```

i just had this issue a few minutes ago, crawled the internet and found nothing. came here to open an issue and found this. it is really frustrating. anyone found a fix?

hi, me and my team have the same problem

Yeah, this just suddenly appeared without client-side code changes, within the last hours.

Here's a patch to fix the issue temporarily:
```python
import huggingface_hub
def patched_repofolder_init(self, **kwargs):
    self.path = kwargs.pop("path")
    self.tree_id = kwargs.pop("oid")
    last_commit = kwargs.pop("lastCommit", None) or kwargs.pop("last_commit", None)
    if last_commit is not None:
        last_commit = huggingface_hub.hf_api.LastCommitInfo(
            oid=last_commit["id"],
            title=last_commit["title"],
            date=huggingface_hub.utils.parse_datetime(last_commit["date"]),
        )
    self.last_commit = last_commit


def patched_repo_file_init(self, **kwargs):
    self.path = kwargs.pop("path")
    self.size = kwargs.pop("size")
    self.blob_id = kwargs.pop("oid")
    lfs = kwargs.pop("lfs", None)
    if lfs is not None:
        lfs = huggingface_hub.hf_api.BlobLfsInfo(size=lfs["size"], sha256=lfs["oid"], pointer_size=lfs["pointerSize"])
    self.lfs = lfs
    last_commit = kwargs.pop("lastCommit", None) or kwargs.pop("last_commit", None)
    if last_commit is not None:
        last_commit = huggingface_hub.hf_api.LastCommitInfo(
            oid=last_commit["id"],
            title=last_commit["title"],
            date=huggingface_hub.utils.parse_datetime(last_commit["date"]),
        )
    self.last_commit = last_commit
    self.security = None

    # backwards compatibility
    self.rfilename = self.path
    self.lastCommit = self.last_commit


huggingface_hub.hf_api.RepoFile.__init__ = patched_repo_file_init
huggingface_hub.hf_api.RepoFolder.__init__ = patched_repofolder_init
```


Also discussed here:
https://discuss.huggingface.co/t/i-keep-getting-keyerror-safe-when-loading-my-datasets/105669/1

i'm thinking this should be a server issue, i mean no client code was changed on my end. so weird!

As far as I can tell, this seems to be happening with **all** datasets that use RepoFolder (probably represents most datasets on huggingface, right?)

> Here is a temporary fix for the problem: https://discuss.huggingface.co/t/i-keep-getting-keyerror-safe-when-loading-my-datasets/105669/12?u=mlscientist

this doesn't seem to work!

In case you are using Colab or similar, remember to restart your session after modyfing the hf_api.py file

No need to modify the file directly, just monkey-patch.

I'm now more sure that the error appears because the backend expects the api code to look like it does on `main`. If `RepoFile` and `RepoFolder` look about like they look on main, they work again.

If not fixed like above, a secondary error that will appear is 
```
    return self.info(path, expand_info=False)["type"] == "directory"
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

    "tree_id": path_info.tree_id,
               ^^^^^^^^^^^^^^^^^
AttributeError: 'RepoFolder' object has no attribute 'tree_id'
```


We've reverted the deployment, please let us know if the issue still persists!

thanks @muellerzr!