Issue #3061564 by cyb.tachyon: Fix null type hint on \Drupal::getContainer()

core/lib/Drupal.php

@@ -121,7 +121,7 @@ public static function unsetContainer() {
   /**
    * Returns the currently active global container.
    *
-   * @return \Symfony\Component\DependencyInjection\ContainerInterface|null
+   * @return \Symfony\Component\DependencyInjection\ContainerInterface
    *
    * @throws \Drupal\Core\DependencyInjection\ContainerNotInitializedException
    */