Florian Jetter created ARROW-2443:
-------------------------------------

             Summary: [Python] Conversion from pandas of empty categorical 
fails with ArrowInvalid
                 Key: ARROW-2443
                 URL: https://issues.apache.org/jira/browse/ARROW-2443
             Project: Apache Arrow
          Issue Type: Bug
    Affects Versions: 0.9.0
            Reporter: Florian Jetter


The conversion of an empty pandas categorical raises an exception. Before 
version `0.9.0` this was possible
{code:java}
import pandas as pd
import pyarrow as pa
pa.Table.from_pandas(pd.DataFrame({'cat': pd.Categorical([])})){code}
raises:

{{ArrowInvalid: Dictionary indices must have non-zero length}}



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