Error writing dataset in `overwrite` mode

[changhiskhan]

If mode="overwrite" and the dataset does not exist, it's supposed to act like "create" but currently it raises an error:

Traceback (most recent call last):
  File "/Users/changshe/code/Image-Search-Service/./populate_db.py", line 41, in <module>
    tbl = populate_db(df, embed_func=dummy_func)
  File "/Users/changshe/code/Image-Search-Service/./populate_db.py", line 24, in populate_db
    tbl = db.create_table('unsplash', data, mode="overwrite")
  File "/Users/changshe/code/eto/lancedb/python/lancedb/db.py", line 89, in create_table
    tbl = LanceTable.create(self, name, data, schema, mode=mode)
  File "/Users/changshe/code/eto/lancedb/python/lancedb/table.py", line 182, in create
    lance.write_dataset(data, tbl._dataset_uri, mode=mode)
  File "/Users/changshe/.venv/lance/lib/python3.10/site-packages/lance/dataset.py", line 654, in write_dataset
    _write_dataset(reader, uri, params)
OSError: LanceError(I/O): Object at location /Users/changshe/code/Image-Search-Service/lance.db/unsplash.lance/_latest.manifest not found: No such file or directory (os error 2)