pydata/pandas — pull request #5301 by jreback (2013-10-23 14:51:25+00:00)
Title: BUG: setting on a frame without an index silenty was failing, related (GH5226)

related to #5226

the following would previously silently fail:

```
In [3]: df = DataFrame(columns=['A','B'])

In [4]: df[0] = Series(1,index=range(4))

In [5]: df
Out[5]:
A B 0
0 NaN NaN 1
1 NaN NaN 1
2 NaN NaN 1
3 NaN NaN 1
```