CLN GH22985 Fixed interpolation with object error message
- [x] closes #22985
- [x] tests added / passed
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

It looks like the problem with #22985 is mostly the mismatch between the input trigger and the error message, so this is just a tiny hotfix. 
Hello @pambot! Thanks for updating the PR.

 - There are no PEP8 issues in the file [`pandas/core/generic.py`](https://github.com/pambot/pandas/blob/cf260da9f390232dd71ac84f80b942a86ee6d262/pandas/core/generic.py) !

 - There are no PEP8 issues in the file [`pandas/tests/frame/test_missing.py`](https://github.com/pambot/pandas/blob/cf260da9f390232dd71ac84f80b942a86ee6d262/pandas/tests/frame/test_missing.py) !



##### Comment last updated on October 08, 2018 at 19:04 Hours UTC # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/23044?src=pr&el=h1) Report
> Merging [#23044](https://codecov.io/gh/pandas-dev/pandas/pull/23044?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/a4482db46535b018053b4351689ccc3c79257d8c?src=pr&el=desc) will **not change** coverage.
> The diff coverage is `100%`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/23044/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/23044?src=pr&el=tree)

```diff
@@           Coverage Diff           @@
##           master   #23044   +/-   ##
=======================================
  Coverage   92.19%   92.19%           
=======================================
  Files         169      169           
  Lines       50904    50904           
=======================================
  Hits        46933    46933           
  Misses       3971     3971
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.61% <100%> (ø)` | :arrow_up: |
| #single | `42.31% <0%> (ø)` | :arrow_up: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/23044?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/core/generic.py](https://codecov.io/gh/pandas-dev/pandas/pull/23044/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZ2VuZXJpYy5weQ==) | `96.65% <100%> (ø)` | :arrow_up: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/23044?src=pr&el=continue).
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> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/23044?src=pr&el=footer). Last update [a4482db...fe13f5b](https://codecov.io/gh/pandas-dev/pandas/pull/23044?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 @jschendel Added the test, please take a look thanks @pambot 