BUG: duplicate indexing with embedded non-orderables (#17610)
- [x] closes #xxxx
- [x] tests added / passed
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] whatsnew entry
closes #17610 
# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/18609?src=pr&el=h1) Report
> :exclamation: No coverage uploaded for pull request base (`master@c1af9a8`). [Click here to learn what that means](https://docs.codecov.io/docs/error-reference#section-missing-base-commit).
> The diff coverage is `100%`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/18609/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/18609?src=pr&el=tree)

```diff
@@            Coverage Diff            @@
##             master   #18609   +/-   ##
=========================================
  Coverage          ?   91.56%           
=========================================
  Files             ?      153           
  Lines             ?    51276           
  Branches          ?        0           
=========================================
  Hits              ?    46950           
  Misses            ?     4326           
  Partials          ?        0
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `89.42% <100%> (?)` | |
| #single | `40.68% <0%> (?)` | |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/18609?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/core/series.py](https://codecov.io/gh/pandas-dev/pandas/pull/18609/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvc2VyaWVzLnB5) | `94.82% <100%> (ø)` | |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/18609?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/18609?src=pr&el=footer). Last update [c1af9a8...ed4dcaa](https://codecov.io/gh/pandas-dev/pandas/pull/18609?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 @gloryfromca no need to create a NEW PR every time this needs updating. simply merge master and push to THIS one. @jreback what else can I do for this?  thanks @gloryfromca  :)

2017-12-21 23:29 GMT+08:00 Jeff Reback <notifications@github.com>:

> thanks @gloryfromca <https://github.com/gloryfromca>
>
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