Provide better defaults for readContainerConfig()

src/Handler.php

@@ -398,7 +398,12 @@ class Handler extends BaseHandler {
     catch (\Exception $ex) {
       // Ignore.
     }
-    return [];
+    return [
+      'NetworkSettings' => [
+        'Gateway' => '127.0.0.1',
+      ],
+      'Mounts' => [],
+    ];
   }
 
 }