fix(redshift): Nil-check before reading from Endpoint

[sklirg]

Description

Resolves #31407 as per suggested: #31407 (comment)

Relations

Resolves #31407

References

#31407 (comment)

Output from Acceptance Testing

I'll run the tests if required, but I don't see how this change will break existing functionality as it fixes a bug where terraform might crash, as per referenced issue. <insert "how did this not work"-imagery here>

[github-actions]

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[github-actions]

Welcome @sklirg 👋

It looks like this is your first Pull Request submission to the Terraform AWS Provider! If you haven’t already done so please make sure you have checked out our CONTRIBUTOR guide and FAQ to make sure your contribution is adhering to best practice and has all the necessary elements in place for a successful approval.

Also take a look at our FAQ which details how we prioritize Pull Requests for inclusion.

Thanks again, and welcome to the community! 😃

[ewbankkit]

LGTM 🚀.

% make testacc TESTARGS='-run=TestAccRedshiftClusterDataSource_basic$$' PKG=redshift
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/redshift/... -v -count 1 -parallel 20  -run=TestAccRedshiftClusterDataSource_basic$ -timeout 180m
=== RUN   TestAccRedshiftClusterDataSource_basic
=== PAUSE TestAccRedshiftClusterDataSource_basic
=== CONT  TestAccRedshiftClusterDataSource_basic
--- PASS: TestAccRedshiftClusterDataSource_basic (275.43s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/redshift	280.708s

[ewbankkit]

@sklirg Thanks for the contribution 🎉 👏.

[github-actions]

This functionality has been released in v5.2.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

I'm going to lock this pull request because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.
If you have found a problem that seems related to this change, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.