Stanford harvest fails

[aaron-collier]

The stanford harvest is failing with the following error:

Traceback (most recent call last):
  File "/home/airflow/.local/lib/python3.9/site-packages/airflow/operators/python.py", line 171, in execute
    return_value = self.execute_callable()
  File "/home/airflow/.local/lib/python3.9/site-packages/airflow/operators/python.py", line 189, in execute_callable
    return self.python_callable(*self.op_args, **self.op_kwargs)
  File "/home/airflow/.local/lib/python3.9/site-packages/dlme_airflow/harvester/source_harvester.py", line 17, in data_source_harvester
    dataframe_to_file(collection)
  File "/home/airflow/.local/lib/python3.9/site-packages/dlme_airflow/utils/dataframe.py", line 36, in dataframe_to_file
    source_df = collection.catalog.read().drop_duplicates(
  File "/home/airflow/.local/lib/python3.9/site-packages/dlme_airflow/drivers/iiif_json.py", line 120, in read
    self._load_metadata()
  File "/home/airflow/.local/lib/python3.9/site-packages/intake/source/base.py", line 285, in _load_metadata
    self._schema = self._get_schema()
  File "/home/airflow/.local/lib/python3.9/site-packages/dlme_airflow/drivers/iiif_json.py", line 110, in _get_schema
    self._open_collection()
  File "/home/airflow/.local/lib/python3.9/site-packages/dlme_airflow/drivers/iiif_json.py", line 25, in _open_collection
    collection_result = requests.get(self.collection_url).json()
  File "/home/airflow/.local/lib/python3.9/site-packages/requests/api.py", line 73, in get
    return request("get", url, params=params, **kwargs)
  File "/home/airflow/.local/lib/python3.9/site-packages/requests/api.py", line 59, in request
    return session.request(method=method, url=url, **kwargs)
  File "/home/airflow/.local/lib/python3.9/site-packages/requests/sessions.py", line 573, in request
    prep = self.prepare_request(req)
  File "/home/airflow/.local/lib/python3.9/site-packages/requests/sessions.py", line 484, in prepare_request
    p.prepare(
  File "/home/airflow/.local/lib/python3.9/site-packages/requests/models.py", line 368, in prepare
    self.prepare_url(url, params)
  File "/home/airflow/.local/lib/python3.9/site-packages/requests/models.py", line 439, in prepare_url
    raise MissingSchema(
requests.exceptions.MissingSchema: Invalid URL 'None': No scheme supplied. Perhaps you meant http://None?

This may be a configuration issue?