[gnome-initial-setup] Check for NULL on um_realm_object_get_common

[Matthias Clasen <matthiasc src gnome org>]

commit 137b3f43c9a9ef2b21e3ee54dcb8af7a80ed3252
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Sep 1 23:37:58 2014 -0400

    Check for NULL on um_realm_object_get_common
    
    um_realm_object_get_common can return NULL, so shouldn't be passed
    unchecked to subsequent functions that will de-reference it.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=705274

 .../pages/account/um-realm-manager.c               |   10 ++++++----
 1 files changed, 6 insertions(+), 4 deletions(-)
---
diff --git a/gnome-initial-setup/pages/account/um-realm-manager.c 
b/gnome-initial-setup/pages/account/um-realm-manager.c
index 5a20ded..b548593 100644
--- a/gnome-initial-setup/pages/account/um-realm-manager.c
+++ b/gnome-initial-setup/pages/account/um-realm-manager.c
@@ -439,12 +439,14 @@ um_realm_is_configured (UmRealmObject *realm)
 {
         UmRealmCommon *common;
         const gchar *configured;
-        gboolean is;
+        gboolean is = FALSE;
 
         common = um_realm_object_get_common (realm);
-        configured = um_realm_common_get_configured (common);
-        is = configured != NULL && !g_str_equal (configured, "");
-        g_object_unref (common);
+        if (common) {
+                configured = um_realm_common_get_configured (common);
+                is = configured != NULL && !g_str_equal (configured, "");
+                g_object_unref (common);
+        }
 
         return is;
 }