Query in redirect block of resource aws_lb_listener_rule can no longer be empty

[ballock]

After commit b3c7930 it is no longer possible to create an aws_lb_listener_rule that redirects to another URL and skips the query entirely. It used to be possible to create a "" query. A null query field defaults to "#{query}", which forwards the ?query=string to the new website. Skipping the query value does the same.

Terraform CLI and Terraform AWS Provider Version

Tested with Terraform 0.15.4. Affected AWS Provider versions from 3.40 to git master.

Affected Resource(s)

• aws_lb_listener_rule

Terraform Configuration Files

Please include all Terraform configurations required to reproduce the bug. Bug reports without a functional reproduction may be closed without investigation.

resource "aws_lb_listener_rule" "my_redirect_rule" {
  listener_arn = aws_lb_listener.my_listener.arn
  priority     = 1

  condition {
    host_header {
      values = ["old.example.com"]
    }
  }

  action {
    type             = "redirect"

    redirect {
      protocol    = "HTTPS"
      port        = "443"
      host        = "new.example.com"
      path        = "/"
      query       = ""
      status_code = "HTTP_301"
    }

  }
}

Expected Behavior

The query field in redirect should be set to empty.

Actual Behavior

│ Error: expected length of action.0.redirect.0.query to be in the range (1 - 128), got 
│ 
│   with aws_lb_listener_rule.my_redirect_rule,
│   on example_rules.tf line 19, in resource "aws_lb_listener_rule" "my_redirect_rule":
│  19:       query       = ""

Steps to Reproduce

1. terraform apply

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[ewbankkit]

@ballock Thanks for raising this issue.
It has already been noticed in #19376. I'm going to close this one as a duplicate so that we can concentrate discussion in the linked issue.
Please add any additional comments there.

[github-actions]

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