fix join-url function import and handle unexpected input (#124)

src/openf1/services/ingestor_livetiming/historical/main.py

@@ -19,7 +19,7 @@
 from openf1.services.ingestor_livetiming.core.processing.main import process_messages
 from openf1.util import join_url
 from openf1.util.db import DbBatchIngestor
-from openf1.util.misc import json_serializer, to_datetime, to_timedelta
+from openf1.util.misc import join_url, json_serializer, to_datetime, to_timedelta
 from openf1.util.schedule import get_meeting_keys
 from openf1.util.schedule import get_schedule as _get_schedule
 from openf1.util.schedule import get_session_keys

src/openf1/util/misc.py

@@ -12,8 +12,10 @@
 
 def join_url(*args) -> str:
     """Join URL parts with a forward slash"""
-    return "/".join([e.strip("/") for e in args if e is not None and
-                    e.strip("/") != ""])
+    if any(len(e) == 0 or e is None for e in args):
+        raise ValueError(f"Invalid URL components: {args}")
+    return "/".join([e.strip("/") for e in args])
+
 
 def timed_cache(expiration_time: float) -> Callable:
     """A decorator to cache the function output for a given duration.

src/openf1/util/schedule.py

@@ -1,11 +1,11 @@
 import json
-import os
 from functools import lru_cache
 
 import requests
 
 from openf1.util import join_url
 from openf1.util.db import get_latest_session_info
+from openf1.util.misc import join_url
 
 
 @lru_cache()