DataFrame.dropna bug fix
Bug fix for #8303.  Now raise KeyError if any non-existent columns are passed in the subset argument.

need a test for this
 pls add a release note in v0.15.0 Bug Fix section as well (and squash when you are done). ping when green. Git references are here: https://github.com/pydata/pandas/wiki/Using-Git
 I added the release note and changed the fix to use the more natural pandas/numpy syntax.  I submitted a new pull request with all of this in one commit.  (I did something bad to my 8303 branch when I tried to rebase and I couldn't push from it - Hopefully I get the hang of rebasing soon.)

On Sep 23, 2014, at 7:23 AM, jreback notifications@github.com wrote:

> pls add a release note in v0.15.0 Bug Fix section as well (and squash when you are done). ping when green. Git references are here: https://github.com/pydata/pandas/wiki/Using-Git
> 
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