aws_lambda_function with dead_letter_config causes a crash

[brikis98]

Terraform Version

terraform v0.9.3, terraform v0.9.6

Affected Resource(s)

• aws_lambda_function

Terraform Configuration Files

resource "aws_lambda_function" "function" {
  function_name = "example"

  filename = "${data.archive_file.source_code.output_path}"
  source_code_hash = "${data.archive_file.source_code.output_base64sha256}"

  runtime = "python2.7"
  handler = "index.handler"

  dead_letter_config {
    target_arn = "${var.dead_letter_target_arn}"
  }
}

variable "dead_letter_target_arn" {
  default = ""
}

Panic Output

Crash log and stderr: https://gist.github.com/brikis98/77c5c8d20f4b54db209abf5a6d4e33d6

Steps to Reproduce

1. Set the dead_letter_target_arn to an empty string
2. terraform apply

[ghost]

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