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import numpy as np
df1 = pandas.DataFrame(data=None, columns=['A','B','C'])
df1 = df1.set_index(['A'])
df2 = pandas.DataFrame(data=[[1,4,7],[2,5,8],[3,6,9]],
df2 = df2.set_index(['A'])
BUG: eradicate use of NULL_INDEX 'singleton', failing unit test for #980
BUG: preserve matching index names in DataFrame.append via concat, In…
…dex.append close GH #980