remove "assert response is not None"

Author: geetu040

openml/_api/clients/http.py

@@ -9,7 +9,7 @@
 import xml
 from collections.abc import Callable, Mapping
 from pathlib import Path
-from typing import Any
+from typing import Any, cast
 from urllib.parse import urlencode, urljoin, urlparse
 
 import requests
@@ -647,7 +647,9 @@ def request(  # noqa: PLR0913, C901
                 delay = self.retry_func(retry_counter)
                 time.sleep(delay)
 
-        assert response is not None
+        # response is guaranteed to be not `None`
+        # otherwise an exception would have been raised before
+        response = cast("Response", response)
 
         if use_cache and self.cache is not None:
             cache_key = self.cache.get_key(url, params)