Output from dataframe_to_rows changed from 2.5.1 to 2.5.2
*Created originally on Bitbucket by [kfollesdal (Kristoffer Føllesdal)](https://bitbucket.org/%7Bc2f46baf-5fdb-4cf9-8096-9b321c30e07f%7D/)* Hi, noticed that the output from the function dataframe_to_rows in openpyxl.utils.dataframe changed from version 2.5.1 to 2.5.2. ``` #!python from pandas import DataFrame from openpyxl.utils.dataframe import dataframe_to_rows d = DataFrame([1,2,3]) print(list(dataframe_to_rows(d, index=True, header=True))) ``` ``` #!python # Output 2.5.1: [[None, 0], [0, 1], [1, 2], [2, 3]] # Output 2.5.2: [[None, 0], FrozenList([None]), [0, 1], FrozenList([None]), [1, 2], FrozenList([None]), [2, 3]] ``` When we write the result to a worksheet the Forzenlist elements make a blank row in between the data. This is change of output is probably not intended?
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