bug: failure if AWS account alias isn't set

[cpboyd]

Currently, the default is to tag with an AWS account alias, but this fails with an error if the account alias has not been set:

  │ Error: reading IAM Account Alias: empty result
  │ 
  │   with module.observe.module.config[0].data.aws_iam_account_alias.current[0],
  │   on .terraform/modules/observe/modules/config/alias.tf line 1, in data "aws_iam_account_alias" "current":
  │    1: data "aws_iam_account_alias" "current" {
  │ 

Suggestions:

1. Use try() or some other method to gracefully handle if this is empty.
2. Allow manual overrides (or custom tags), in case someone wants to make use of this tag without setting an alias within AWS.

Workaround:

  config = {
    tag_account_alias      = false
  }

[cpboyd]

Ah, it's an error with Hashicorp's AWS provider: hashicorp/terraform-provider-aws#29324

Still, a manual override would be nice.