BUG GH23224 Allow integer_array to be initialized with all None
State: closed

- [X] closes #23224
- [X] tests added / passed
- [X] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

Allows for initialization of `integer_array` with `[None]`, lists of `None`, and lists made of only `None` and other na types

Labels:
name: Bug
name: Missing-data
description: np.nan, pd.NaT, pd.NA, dropna, isnull, interpolate
name: ExtensionArray
description: Extending pandas with custom dtypes or arrays.

Comments:
Hello @JustinZhengBC! Thanks for submitting the PR.

 - There are no PEP8 issues in the file [`pandas/core/arrays/integer.py`](https://github.com/JustinZhengBC/pandas/blob/4fd3202ff8964c01674cd75f1d16217815e34c30/pandas/core/arrays/integer.py) !

 - There are no PEP8 issues in the file [`pandas/tests/arrays/test_integer.py`](https://github.com/JustinZhengBC/pandas/blob/4fd3202ff8964c01674cd75f1d16217815e34c30/pandas/tests/arrays/test_integer.py) !


# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/23237?src=pr&el=h1) Report
> :exclamation: No coverage uploaded for pull request base (`master@cb8a67e`). [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/23237/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/23237?src=pr&el=tree)

```diff
@@            Coverage Diff            @@
##             master   #23237   +/-   ##
=========================================
  Coverage          ?   92.19%           
=========================================
  Files             ?      169           
  Lines             ?    50974           
  Branches          ?        0           
=========================================
  Hits              ?    46997           
  Misses            ?     3977           
  Partials          ?        0
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.62% <100%> (?)` | |
| #single | `42.27% <0%> (?)` | |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/23237?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/core/arrays/integer.py](https://codecov.io/gh/pandas-dev/pandas/pull/23237/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvYXJyYXlzL2ludGVnZXIucHk=) | `95.12% <100%> (ø)` | |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/23237?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/23237?src=pr&el=footer). Last update [cb8a67e...14399b1](https://codecov.io/gh/pandas-dev/pandas/pull/23237?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).

lgtm. i think you need to merge master and push again. ping on green.
@jreback green now. I also moved my test cases to another more appropriate test that someone added since I last pulled.
thanks @JustinZhengBC 
@JustinZhengBC feel free to open a follow-up PR