fix: improve a test

Author: juancarlospaco

tests/test_qdrant.py

@@ -76,7 +76,7 @@ def test_qdrant_migrate_bad_url(
                     "qdrant",
                     "migrate",
                     qdrant_collection_name,
-                    "INVALID",  # Bad HTTP URL as intended.
+                    "",  # Bad HTTP URL as intended.
                     "",  # no API key needed in :memory: mode
                     postgres_connection_string,
                 ],