Notice > Undefined index: page

Hi there,

On development environment, I’ve enabled notices and here is what I see from the wp-admin panel:

ErrorException thrown with message "Undefined index: page"

Stacktrace:
#6 ErrorException in wp-contents/plugins/adback-solution-to-adblock/admin/class-ad-back-admin.php:523
#5 Handle error in wp-contents/plugins/adback-solution-to-adblock/admin/class-ad-back-admin.php:523
#4 Ad_Back_Admin:addConfigNotice in wp-includes/class-wp-hook.php:286
#3 WP_Hook:apply_filters in wp-includes/class-wp-hook.php:310
#2 WP_Hook:do_action in wp-includes/plugin.php:465
#1 do_action in wp-admin/admin-header.php:281
#0 include in wp-admin/index.php:111

The concerned line is the following one (from file wp-contents/plugins/adback-solution-to-adblock/admin/class-ad-back-admin.php:523):
if (!$this->isConnected() && !in_array($_REQUEST['page'], array('ab', 'ab-placements', 'ab-message', 'ab-settings', 'ab-diagnostic'))) {

The $_REQUEST['page'] does not exist. A simple $page declaration is enought to fix the notice:

$page = isset($_REQUEST['page']) ? $_REQUEST['page'] : '';
if (!$this->isConnected() && !in_array($page, array('ab', 'ab-placements', 'ab-message', 'ab-settings', 'ab-diagnostic'))) {

Regards,