resolve #18361

Its possible for a dynamic parameter option value to be an empty string which will cause the following error in the Radix Select component. The solution is to handle empty strings so that they are not set directly in the component.

Uncaught Error: A <Select.Item /> must have a value prop that is not an empty string. This is because the Select value can be set to an empty string to clear the selection and show the placeholder.

data "coder_parameter" "radio" {
  name         = "radio"
  display_name = "An example of a radio input"
  description  = "The next parameter supports a single value."
  type         = "string"
  form_type    = "dropdown"
  order        = 1
  default      = ""

  option {
    name = "Empty"
    value = "" 
  }
}