TypeError: count(): Argument #1 ($value) must be of type Countable|array, bool given in cc->get_all_lists()

This is failing:

  function get_lists($action = 'lists', $exclude = 3) {
    $xml = $this->load_url($action);

    if (!$xml) {
      return FALSE;
    }

$xml is coming back empty, for some reason.

It turns out that this is another symptom of Constant Contact's APIs changing and the module not updating to match.