Subscribing to extra list

I’ve tried to fix the problem myself, using inspiration from another thread (https://ww.wp.xz.cn/support/topic/modification-to-allow-adding-to-lists/).

I’ve replaced the code around line 109 with the following, I tested it and it worked.

		try {
			$subscriberExists = \MailPoet\API\API::MP('v1')->getSubscriber($subscriber_data['email']);
		} catch(Exception $exception) {
			if ( $subscriberExists == '' ) {
				try {
					$subscriber = \MailPoet\API\API::MP('v1')->addSubscriber($subscriber_data, $mailpoetlists);
				} catch (Exception $exception) {
					// return $exception->getMessage();
				}
			}
		}

		if ($subscriberExists != '' ) {
			try {
				$subscriber = \MailPoet\API\API::MP('v1')->subscribeToLists($subscriber_data['email'], $mailpoetlists);
			} catch (Exception $exception) {
				// return $exception->getMessage();
			}				
		}