Condition blocks must be dynamic to support empty optional listener_http_header_conditions

[jhosteny]

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Describe the Bug

#40 added support for optional HTTP headers. However, if none are supplied, the condition block is instantiated with no content.

Error: One of host_header, http_header, http_request_method, path_pattern, query_string or source_ip must be set in a condition block

  on .terraform/modules/ecs_web_app.alb_ingress/main.tf line 78, in resource "aws_lb_listener_rule" "authenticated_paths_oidc":
  78: resource "aws_lb_listener_rule" "authenticated_paths_oidc" {

Expected Behavior

The condition should not be added to the listener rule if there are no optional headers.

Steps to Reproduce

Apply the module with no optional headers

Screenshots

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Environment (please complete the following information):

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Additional Context

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