Remove import exception handling
Imports should succeed on all versions of Python that pandas supports.
# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/17218?src=pr&el=h1) Report
> Merging [#17218](https://codecov.io/gh/pandas-dev/pandas/pull/17218?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/f165b90ed27487287e1c8a0a6c4e66344b2c731d?src=pr&el=desc) will **decrease** coverage by `0.04%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/17218/graphs/tree.svg?width=650&height=150&src=pr&token=eZ4WkYLtcO)](https://codecov.io/gh/pandas-dev/pandas/pull/17218?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #17218      +/-   ##
==========================================
- Coverage   91.02%   90.98%   -0.05%     
==========================================
  Files         162      162              
  Lines       49517    49517              
==========================================
- Hits        45075    45054      -21     
- Misses       4442     4463      +21
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `88.76% <ø> (-0.03%)` | :arrow_down: |
| #single | `40.26% <ø> (-0.07%)` | :arrow_down: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/17218?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/io/gbq.py](https://codecov.io/gh/pandas-dev/pandas/pull/17218?src=pr&el=tree#diff-cGFuZGFzL2lvL2dicS5weQ==) | `25% <0%> (-58.34%)` | :arrow_down: |
| [pandas/plotting/\_converter.py](https://codecov.io/gh/pandas-dev/pandas/pull/17218?src=pr&el=tree#diff-cGFuZGFzL3Bsb3R0aW5nL19jb252ZXJ0ZXIucHk=) | `63.23% <0%> (-1.82%)` | :arrow_down: |
| [pandas/core/frame.py](https://codecov.io/gh/pandas-dev/pandas/pull/17218?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZnJhbWUucHk=) | `97.71% <0%> (-0.1%)` | :arrow_down: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/17218?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/17218?src=pr&el=footer). Last update [f165b90...29f4798](https://codecov.io/gh/pandas-dev/pandas/pull/17218?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 Thanks @dhimmel !