[ISSUE] databricks_mws_workspaces returns null ids when no workspaces are available

[VenelinMartinov]

Configuration

terraform {
  required_providers {
    databricks = {
      source  = "databricks/databricks"
      version = ">= 1.63.0"
    }
  }
}

data "databricks_mws_workspaces" "example" {}

output "workspace_ids" {
  value = data.databricks_mws_workspaces.example.ids
}

output "workspace_count" {
  value = length(data.databricks_mws_workspaces.example.ids)
}

Expected Behavior

I'd expect the workspace_count output to be 0

Actual Behavior

Terraform throws an error: Invalid value for "value" parameter: argument must not be null.

Steps to Reproduce

1. terraform apply

Terraform and provider versions

Terraform v1.10.4
on darwin_arm64

Is it a regression?

no

Important Factoids

The additional context here is that I am one of the maintainers of the pulumi-databricks provider: https://github.com/pulumi/pulumi-databricks

There this issue manifests as a null pointer exception in the languages which have this (like C#).

Would you like to implement a fix?

I'd be happy to if you gave me some pointers about setting up tests for this.

[VenelinMartinov]

Raised a PR for this: #4414

Let me know if you have any feedback here!