Admin Notification E-Mail broken and filter/option required

Hey,
I noticed the function sendEmailAboutNewSubscriptionToAdmin in alertme\inc\front-end\alertme-ajaxrequest.php is broken because you’re using the variable “$email” in line 167 without declaring it before:

wp_mail( $email, $subject, nl2br($confirmation_email_body), $headers );

You should declare the $email variable like:

$email = get_option( 'admin_email' );
wp_mail( $email, $subject, nl2br($confirmation_email_body), $headers ); 

However many admins – like me – do not want to receive these notifications. Please add an option (or at least a filter) to deactivate the notification e-mail like:

$email = apply_filters( 'alertme_send_subscribe_notification_to_admin', get_option( 'admin_email' ) );
if( ! empty($email) ) wp_mail( $email, $subject, nl2br($confirmation_email_body), $headers ); 

If the filter returns false no e-mail will be send and in addition the user can use the filter to alter the recipient.

Thank you!