hf_search_models() seems broken

```
huggingfaceR:::hf_search_models("facebook")
``` 
results in `Cannot convert object to an environment: [type=list; target=ENVSXP].`
while
```
reticulate::py$hf_api$list_models(filter = reticulate::py$ModelFilter(author = "facebook"))
```
behaves as expected. It looks like reticulate::iterate is being used on a list which doesn't work.