[BUGFIX] argilla: Prevent errors checking Dataset instances when datasets is not installed.

[frascuchon]

Description

When datasets package is not installed, checks to identify if a list of records is a Dataset instance fails:

File ~/Projects/argilla-io/argilla/argilla/src/argilla/records/_dataset_records.py:358, in DatasetRecords._ingest_records(self, records, mapping, user_id)
    356 if len(records) == 0:
    357     raise ValueError("No records provided to ingest.")
--> 358 if HFDatasetsIO._is_hf_dataset(dataset=records):
    359     records = HFDatasetsIO._record_dicts_from_datasets(dataset=records)
    360 if all(map(lambda r: isinstance(r, dict), records)):
    361     # Records as flat dicts of values to be matched to questions as suggestion or response

File ~/Projects/argilla-io/argilla/argilla/src/argilla/records/_io/_datasets.py:52, in HFDatasetsIO._is_hf_dataset(dataset)
     43 """Check if the object is a Hugging Face dataset.
     44
     45 Parameters:
   (...)
     49     bool: True if the object is a Hugging Face dataset, False otherwise.
     50 """
     51 HFDataset = _resolve_hf_datasets_type()
---> 52 return isinstance(dataset, HFDataset)

TypeError: isinstance() arg 2 must be a type or tuple of types

Thanks for reporting this, @maxserras

Type of change

(Please delete options that are not relevant. Remember to title the PR according to the type of change)

• Bug fix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

How Has This Been Tested

(Please describe the tests that you ran to verify your changes. And ideally, reference tests)

• Test A
• Test B

Checklist

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• My changes generate no new warnings
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