Fix nil pointer deref panic on helm_release destroy

[sbocinec]

Description

Fix nil pointer deref panic in helm_resource introduced in 2.16.0 through GH-1487. This occurs, when the to-be-destroyed resource no more exists in K8s and helm returns "release not found" as the response is nil in this case.

Fixes https://github.com/hashicorp/terraform-provider-helm/issues/1500

Acceptance tests

• [ ] Have you added an acceptance test for the functionality being added?

Release Note

Release note for CHANGELOG:

Fix helm_resource destroy panic when helm chart release is not found

References

• https://github.com/hashicorp/terraform-provider-helm/issues/1500
• https://github.com/hashicorp/terraform-provider-helm/pull/1487

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