terraform-provider-aws: aws_lb_target_group health_check.0.matcher no longer defaults to 200

The LB target group health check matcher default value has changed from versions 1.2 of aws provider to 1.3.0 of the aws provider.

Terraform Version

0.10.7

Affected Resource(s)

Please list the resources as a list, for example:

• aws_lb_target_group

resource "aws_alb_target_group" "curalate_alb_target_group" {
  name     = "${var.name}"
  port     = "${var.target_group_port}"
  protocol = "${var.target_group_protocol}"
  vpc_id   = "${var.vpc_id}"

  health_check {
    healthy_threshold   = "${var.healthy_threshold}"
    unhealthy_threshold = "${var.unhealthy_threshold}"
    timeout             = "${var.health_check_timeout}"
    path                = "${var.health_check_path}"
    interval            = "${var.health_check_interval}"
  }

  tags = "${merge(var.extra_tags, map("Terraform", "true", "Name", var.name))}"
}

If this issue appears to affect multiple resources, it may be an issue with Terraform’s core, so please mention this.

Debug Output

  ~ module.taxonomy-service.module.curalate_ecs_service_alb.aws_alb_target_group.curalate_alb_target_group
      health_check.0.matcher:                     "200" => ""

Expected Behavior

An unset health checker shoulder set the matcher codes to 200 per the documentation

Actual Behavior

AWS Provider 1.2 worked fine. With aws provider 1.3.0 the matcher is no set to an empty string and this is invalid

11:28:57 * module.taxonomy-service.module.curalate_ecs_service_alb.aws_alb_target_group.curalate_alb_target_group: 1 error(s) occurred:
11:28:57 
11:28:57 * aws_alb_target_group.curalate_alb_target_group: Error modifying Target Group: ValidationError: Health check matcher HTTP code cannot be empty
11:28:57 	status code: 400, request id: 639f20ca-cb04-11e7-910d-fbedb2576999
11:28:57 
11:28:57 Terraform does not automatically rollback in the face of errors.
11:28:57 Instead, your Terraform state file has been partially updated with
11:28:57 any resources that successfully completed. Please address the error
11:28:57 above and apply again to incrementally change your infrastructure.

Steps to Reproduce

Please list the steps required to reproduce the issue, for example:

1. terraform apply