Undefined variable: current_page in panels_mini_block_list_alter()

There is an issue in mini panels:

Undefined variable: current_page in panels_mini_block_list_alter()

This does not throw an error but rather a notice in PHP.

The culprit code is here:

  if (module_exists('page_manager')) {
    $current_page = page_manager_get_current_page();
  }

Which throws the notice here:

if (!$current_page || empty($current_page['contexts'])) {

Where the variable should still be instantiated even if page_manager doesn't get picked up by module_exists().

A possible fix:

  $current_page = false;
  if (module_exists('page_manager')) {
    $current_page = page_manager_get_current_page();
  }