r/aws_grafana_workspace: fix expander panics

[jar-b]

Description

The expanders for the network_access_control and vpc_configuration arguments did not check for a list of one nil item, resulting in a failed type assertion and panic when a single, empty configuration is provided.

Relations

Closes #38264

Output from Acceptance Testing

% make testacc PKG=grafana TESTS=TestAccGrafana_serial/Workspace
make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.22.6 test ./internal/service/grafana/... -v -count 1 -parallel 20 -run='TestAccGrafana_serial/Workspace'  -timeout 360m

--- PASS: TestAccGrafana_serial (6114.72s)
    --- PASS: TestAccGrafana_serial/Workspace (6114.72s)
        --- PASS: TestAccGrafana_serial/Workspace/saml (350.87s)
        --- PASS: TestAccGrafana_serial/Workspace/permissionType (402.51s)
        --- PASS: TestAccGrafana_serial/Workspace/tags (371.33s)
        --- PASS: TestAccGrafana_serial/Workspace/configuration (675.03s)
        --- PASS: TestAccGrafana_serial/Workspace/networkAccess (709.10s)
        --- SKIP: TestAccGrafana_serial/Workspace/sso (0.57s)
        --- PASS: TestAccGrafana_serial/Workspace/disappears (416.76s)
        --- SKIP: TestAccGrafana_serial/Workspace/organization (0.89s)
        --- PASS: TestAccGrafana_serial/Workspace/dataSources (347.22s)
        --- PASS: TestAccGrafana_serial/Workspace/notificationDestinations (397.44s)
        --- PASS: TestAccGrafana_serial/Workspace/vpc (1222.79s)
        --- PASS: TestAccGrafana_serial/Workspace/version (1220.20s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/grafana    6120.565s

[github-actions]

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[github-actions]

Thank you for your contribution! 🚀

A new usage of AWS SDK for Go V1 was detected. Please prefer AWS SDK for Go V2 for all net-new services. If this is an enhancement or bug fix to an existing AWS SDK Go V1 based resource, this comment can be safely ignored.

For additional information refer to the AWS SDK for Go Versions page in the contributor guide.

[ewbankkit]

LGTM 🚀.

[github-actions]

This functionality has been released in v5.63.0 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]

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