#26479 Clear notice if Autoloader was not registered properly, instead of passing the error to higher levels

Author: lbajsarowicz

lib/internal/Magento/Framework/Autoload/AutoloaderRegistry.php

@@ -34,12 +34,12 @@ public static function registerAutoloader(AutoloaderInterface $newAutoloader)
      * @throws \Exception
      * @return AutoloaderInterface
      */
-    public static function getAutoloader()
+    public static function getAutoloader(): AutoloaderInterface
     {
-        if (self::$autoloader !== null) {
-            return self::$autoloader;
-        } else {
+        if (!self::$autoloader instanceof AutoloaderInterface) {
             throw new \Exception('Autoloader is not registered, cannot be retrieved.');
         }
+
+        return self::$autoloader;
     }
 }