Add annotation for the Bridge property

[MAILPOET-4047]

mailpoet/lib/Cron/Workers/KeyCheck/KeyCheckWorker.php

@@ -10,6 +10,7 @@ use MailPoet\WP\Functions as WPFunctions;
 use MailPoetVendor\Carbon\Carbon;
 
 abstract class KeyCheckWorker extends SimpleWorker {
+  /** @var Bridge|null */
   public $bridge;
 
   /** @var CronWorkerScheduler */

mailpoet/lib/Cron/Workers/KeyCheck/PremiumKeyCheck.php

@@ -25,6 +25,9 @@ class PremiumKeyCheck extends KeyCheckWorker {
   }
 
   public function checkKey() {
+    // for phpstan because we set bridge property in the init function
+    if (!$this->bridge) return;
+
     $premiumKey = $this->settings->get(Bridge::PREMIUM_KEY_SETTING_NAME);
     $result = $this->bridge->checkPremiumKey($premiumKey);
     $this->bridge->storePremiumKeyAndState($premiumKey, $result);

mailpoet/lib/Cron/Workers/KeyCheck/SendingServiceKeyCheck.php

@@ -46,6 +46,9 @@ class SendingServiceKeyCheck extends KeyCheckWorker {
   }
 
   public function checkKey() {
+    // for phpstan because we set bridge property in the init function
+    if (!$this->bridge) return;
+
     $wasPendingApproval = $this->servicesChecker->isMailPoetAPIKeyPendingApproval();
 
     $mssKey = $this->settings->get(Mailer::MAILER_CONFIG_SETTING_NAME)['mailpoet_api_key'];