[gxml] Fixes on make check

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit f1e4993f12f431ba900bbd70051c5073f240f08d
Author: Daniel Espinosa <esodan gmail com>
Date:   Wed Dec 28 14:40:00 2016 -0600

    Fixes on make check

 test/GomSerializationTest.vala |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/test/GomSerializationTest.vala b/test/GomSerializationTest.vala
index 00c40c8..9371e78 100644
--- a/test/GomSerializationTest.vala
+++ b/test/GomSerializationTest.vala
@@ -480,8 +480,12 @@ class GomSerializationTest : GXmlTest  {
       string s = parser.write_string ();
       assert (s != null);
       GLib.message ("Doc:"+s);
+      assert (b != null);
+      assert (b.child_nodes != null);
       assert (b.child_nodes.size == 0);
+      assert (b.attributes != null);
       assert (b.attributes.size == 0);
+      assert (b.name != null);
       assert (b.name == "Loco");
       s = parser.write_string ();
       assert (s != null);