BUG, dot product with empty dataframe

[qian0]

Dot product of empty dataframe resulted in dataframe filled with zeros.
I thought the expected ones would be empty or NaN?

In [3]: df = pd.DataFrame(index = ['a','b'])

In [4]: srs = pd.Series()

In [5]: df
Out[5]:
Empty DataFrame
Columns: []
Index: [a, b]

In [6]: srs
Out[6]: Series([], dtype: float64)

In [7]: df.dot(srs)
Out[7]:
a 0
b 0
dtype: float64

[jreback]

This is as expected as seen below.

In [2]: df = pd.DataFrame(index = ['a','b'])

In [3]: srs = pd.Series()

In [4]: np.dot(df.values, srs.values)
Out[4]: array([ 0.,  0.])