[librest] tests: Fix lastfm test

[Christophe Fergeau <teuf src gnome org>]

commit 3825a2b150972112627eebf5d1caaa095b90ee53
Author: Christophe Fergeau <cfergeau redhat com>
Date:   Tue Oct 6 11:26:28 2015 +0200

    tests: Fix lastfm test
    
    Since August 17th 2015, user.getInfo no longer returns an 'id' node.
    It's not clear whether that's a bug server-side, or a permanent change.
    Since it has been 2 months already, make the 'id' node optional in the
    lastfm test rather than having a hard failure when it's missing.

 tests/lastfm.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/tests/lastfm.c b/tests/lastfm.c
index fba2fe2..b6af16e 100644
--- a/tests/lastfm.c
+++ b/tests/lastfm.c
@@ -71,8 +71,8 @@ main (int argc, char **argv)
   g_assert (u_node);
 
   node = rest_xml_node_find (u_node, "id");
-  g_assert (node);
-  g_assert_cmpstr (node->content, ==, "17038");
+  if (node != NULL)
+      g_assert_cmpstr (node->content, ==, "17038");
 
   node = rest_xml_node_find (u_node, "name");
   g_assert (node);