Error when no topic list is set in a queue

[gferrazoli]

When creating a queue in config.ex there's a problem where you need to set an empty list when no topics are needed in the queue itself.

Working:

config :ex_aws_configurator,
  queues: %{
    test_queue: %{
      prefix: "prefix",
      options: [raw_message_delivery: true],
      topics: []
    }

Not working:

config :ex_aws_configurator,
  queues: %{
    test_queue: %{
      prefix: "prefix",
      options: [raw_message_delivery: true]
    }