feat(python): check vector query is not None (#1847)

Fix the type hints of `nearest_to` method, and raise `ValueError` when
the input is None

python/python/tests/test_query.py

@@ -1,15 +1,5 @@
-#  Copyright 2023 LanceDB Developers
-#
-#  Licensed under the Apache License, Version 2.0 (the "License");
-#  you may not use this file except in compliance with the License.
-#  You may obtain a copy of the License at
-#      http://www.apache.org/licenses/LICENSE-2.0
-#
-#  Unless required by applicable law or agreed to in writing, software
-#  distributed under the License is distributed on an "AS IS" BASIS,
-#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-#  See the License for the specific language governing permissions and
-#  limitations under the License.
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright The LanceDB Authors
 
 import unittest.mock as mock
 from datetime import timedelta
@@ -342,6 +332,12 @@ async def test_query_to_pandas_async(table_async: AsyncTable):
     assert df.shape == (0, 4)
 
 
+@pytest.mark.asyncio
+async def test_none_query(table_async: AsyncTable):
+    with pytest.raises(ValueError):
+        await table_async.query().nearest_to(None).to_arrow()
+
+
 @pytest.mark.asyncio
 async def test_fast_search_async(tmp_path):
     db = await lancedb.connect_async(tmp_path)