## Description
Without this change, there were intermittent failures due to a non-empty t.TempDir() directory at the end of a test:
```console
$ go test -run=LoadChunk$ ./snapshots/ -count=220 -failfast
--- FAIL: TestManager_LoadChunk (0.01s)
testing.go:1225: TempDir RemoveAll cleanup: unlinkat /var/folders/.../T/TestManager_LoadChunk1472891739/001: directory not empty
FAIL
FAIL cosmossdk.io/store/snapshots 0.177s
```
With this change, I can no longer reproduce the flaky failure:
```console
$ go test -run=LoadChunk$ ./snapshots/ -count=1000 -failfast
ok cosmossdk.io/store/snapshots 15.722s
```
---
### Author Checklist
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## Description
Closes: [cosmos/gaia#2313](https://github.com/cosmos/gaia/issues/2313)
The gaia v9 upgrade causes node to errors out when querying historical states before the upgrade. This is because we added a new module store in the upgrade which is the `provider module store`. Thus, every times we load the multi store for querying at a height prior to the upgrade, we try to load the `provider module store` and fail since it has not existed before the upgrade.
I make changes to `CacheMultiStoreWithVersion` so that if we fail to load any module store at a given height, we check if that module store has existed at that height or not (using `getCommitInfo()`), we can ignore the error if the store hasn't existed at that given height.
---
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* [ ] included the necessary unit and integration [tests](https://github.com/cosmos/cosmos-sdk/blob/main/CONTRIBUTING.md#testing)
* [ ] added a changelog entry to `CHANGELOG.md`
* [ ] included comments for [documenting Go code](https://blog.golang.org/godoc)
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## Description
- Return an exported type rather than an unexported type, from an exported function
- Assign error values to _
- Add reason to nolint directive
- Remove ineffectual assignment
- Remove checked cast to same type as value
---
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### Reviewers Checklist
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I have...
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- [ ] confirmed that this PR does not change production code
Co-authored-by: Marko <marbar3778@yahoo.com>
Co-authored-by: Emmanuel T Odeke <emmanuel@orijtech.com>
Co-authored-by: Marko <marko@baricevic.me>
Co-authored-by: Aleksandr Bezobchuk <alexanderbez@users.noreply.github.com>
