Adding new rows drops index name

[stared]

df = pd.DataFrame({'x': [1,2,6], 'y': [2,2,8], 'z':[-5,0,5]})
df = df.set_index('z')

Then df.index.name is 'z'. After modifying an existing row

df.loc[5] = {'x': 9, 'y': 99}

it's still fine. But once we add a new index:

df.loc[10] = {'x': 7, 'y': 77}

df.index.name is None.

I use Pandas 0.16.0 on Python 3.4.

It might be related to another issue with disappearing index name: #9854

[jameshiebert]

I'm looking that this one

[ksanghai]

@jameshiebert I fixed this issue and is pending as PR #9876

[jreback]

closed by #9876