Fixed KDE Plot to drop the missing values
 - [x] closes https://github.com/pandas-dev/pandas/issues/14821
 - [x] tests added / passed
 - [ ] passes ``git diff upstream/master | flake8 --diff``
 - [x] whatsnew entry


## [Current coverage](https://codecov.io/gh/pandas-dev/pandas/pull/14820?src=pr) is 85.30% (diff: 100%)
> Merging [#14820](https://codecov.io/gh/pandas-dev/pandas/pull/14820?src=pr) into [master](https://codecov.io/gh/pandas-dev/pandas/branch/master?src=pr) will increase coverage by **<.01%**

```diff
@@             master     #14820   diff @@
==========================================
  Files           144        144          
  Lines         50957      51004    +47   
  Methods           0          0          
  Messages          0          0          
  Branches          0          0          
==========================================
+ Hits          43469      43511    +42   
- Misses         7488       7493     +5   
  Partials          0          0          
```

> Powered by [Codecov](https://codecov.io?src=pr). Last update [86233e1...4273f8e](https://codecov.io/gh/pandas-dev/pandas/compare/86233e15193c3bcd0f646915891ca6c7892335d9...4273f8e9f53d49988fcdefc2e5afb61e9bdc57ff?src=pr) Can you add a test and a release note in whatsnew/0.19.2? Yes, I can do that can you rebase, problem with appeveyor which i just fixed Sure, I'll do that!

On Sat, Dec 10, 2016 at 10:33 AM Jeff Reback <notifications@github.com>
wrote:

> can you rebase, problem with appeveyor which i just fixed
>
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>
 @jreback - Is there a problem with the Travis CI?  you need to rebase on current master, I fixed this yesterday. Thanks @jreback - have rebased now. One small change, then we should be good! We're aware of that travis failure on the 3.4 build. @keshavramaswamy thanks!