Provide working fallback config

Author: danog

lib/Rfc8484StubResolver.php

@@ -74,7 +74,7 @@ public function resolve(string $name, int $typeRestriction = null): Promise
                 try {
                     yield $this->reloadConfig();
                 } catch (ConfigException $e) {
-                    $this->config = new Config([], []);
+                    $this->config = new Config(['0.0.0.0'], []);
                 }
             }
 
@@ -232,7 +232,7 @@ public function query(string $name, int $type): Promise
                 try {
                     yield $this->reloadConfig();
                 } catch (ConfigException $e) {
-                    $this->config = new Config([], []);
+                    $this->config = new Config(['0.0.0.0'], []);
                 }
             }