code: def test_empty_query(api):
      with pytest.raises(ValueError):
          api.query()
  
imports: from contextlib import contextmanager
  from datetime import datetime, date, timedelta
  import pytest
  import requests_mock
  from requests.exceptions import StreamConsumedError, ContentDecodingError, InvalidProxyURL, InvalidHeader, TooManyRedirects, ReadTimeout, SSLError
  from sentinelsat import format_query_date, SentinelAPI
  from sentinelsat.exceptions import QuerySyntaxError, QueryLengthError, UnauthorizedError
  from sentinelsat.sentinel import _format_order_by
label_desc: Use image node_id 25 for calling a global function with example usage: test_empty_query(api) without return types