ignore_facet_check search option appears to be broken

[bouweandela]

When I run this script:

import logging

import pyesgf.search


def example():
    logging.basicConfig(format="%(asctime)s [%(process)d] %(levelname)-8s "
                        "%(name)s,%(lineno)s\t%(message)s")
    pyesgf.search.connection.log.setLevel(logging.DEBUG)
    conn = pyesgf.search.SearchConnection(
        url='http://esgf-node.llnl.gov/esg-search')
    ctx = conn.new_context(project='CMIP5')
    ctx.search(ignore_facet_check=True)


if __name__ == '__main__':
    example()

the code crashes with the following output:

DEBUG:pyesgf.search.connection:Query dict is MultiDict([('format', 'application/solr+json'), ('limit', 0), ('distrib', 'true'), ('type', 'Dataset'), ('project', 'CMIP5')])
DEBUG:pyesgf.search.connection:Query request is http://esgf-node.llnl.gov/esg-search/search?format=application%2Fsolr%2Bjson&limit=0&distrib=true&type=Dataset&project=CMIP5
Traceback (most recent call last):
  File "/home/bandela/src/esmvalgroup/esmvalcore/try_filesearch.py", line 96, in <module>
    example()
  File "/home/bandela/src/esmvalgroup/esmvalcore/try_filesearch.py", line 92, in example
    ctx.search(ignore_facet_check=True)
  File "/home/bandela/conda/envs/esmvaltool/lib/python3.9/site-packages/pyesgf/search/context.py", line 126, in search
    sc.__update_counts(ignore_facet_check=ignore_facet_check)
  File "/home/bandela/conda/envs/esmvaltool/lib/python3.9/site-packages/pyesgf/search/context.py", line 207, in __update_counts
    for facet, counts in (list(response['facet_counts']['facet_fields'].items())):
KeyError: 'facet_counts'