Notice: Undefined variable: forms in custom_pub_forms()

On a clean install of Drupal 7 I get the following notice:

Notice: Undefined variable: forms in custom_pub_forms() (line 85 of [site_root]\sites\all\modules\custom_pub\custom_pub.module).

I am able to add a custom publishing option, and it shows up on the add/edit content form. However, the notice doesn't go away!

My limited brain suggests that it is because the custom_pub_forms() function will not always return the correct type of array as specified here.

I found that if i explicitly set the $forms variable, this fixes the problem and doesn't appear to break anything:

/**
 * Implements hook_forms()
 */
function custom_pub_forms($form_id, $args) {
  //We need to use this hook because on the admin page there is the possiblity of multiple forms for the edit form. See http://drupal.org/node/354519
  $types = variable_get('custom_pub_types', array());
  // define $forms in case the following conditions aren't matched
  $forms = array();
  foreach ($types as $type) {
    if ($form_id == 'custom_pub_edit_'.$type['type']) {
      $forms[$form_id] = array('callback' => 'custom_pub_edit');
    }
  }
  if ($form_id == 'node_admin_content') {
    module_load_include('inc','node', 'node.admin');
    $forms['node_admin_content'] = array(
      'callback' => 'custom_pub_node_admin_content',
    );
  }
  return $forms;
}

Any ideas what the actual problem is here, and what the *real* fix should be?
Thanks!