Set default to error instead of drop (#259)

when encountering bad input data, we can default to principle of least
surprise and raise an exception.

Co-authored-by: Chang She <chang@lancedb.com>

python/lancedb/remote/__init__.py

@@ -15,7 +15,6 @@ import abc
 from typing import List, Optional
 
 import attr
-import pandas as pd
 import pyarrow as pa
 from pydantic import BaseModel