Update to Drupal 8.2.0. For more information, see https://www.drupal.org/project/drupal/releases/8.2.0

core/lib/Drupal/Core/Discovery/YamlDiscovery.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace Drupal\Core\Discovery;
+
+use Drupal\Component\Discovery\YamlDiscovery as ComponentYamlDiscovery;
+use Drupal\Core\Serialization\Yaml;
+
+/**
+ * Provides discovery for YAML files within a given set of directories.
+ *
+ * This overrides the Component file decoding with the Core YAML implementation.
+ */
+class YamlDiscovery extends ComponentYamlDiscovery {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function decode($file) {
+    return Yaml::decode(file_get_contents($file)) ?: [];
+  }
+
+}