[gnome-control-center] user-accounts: fix crash for incompatible realmd version

[Ray Strode <halfline src gnome org>]

commit a41624305039f7d3e0503e72ea63268da8b80242
Author: Ray Strode <rstrode redhat com>
Date:   Mon Aug 20 13:52:49 2012 -0400

    user-accounts: fix crash for incompatible realmd version
    
    The version property may not be available if realmd is
    version 0.1 (which lacked the property) or if other
    properties changed signatures (causing gdbus to fail to load
    cache any property)
    
    This commit fixes a crash where property is NULL in those cases.

 panels/user-accounts/um-realm-manager.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/panels/user-accounts/um-realm-manager.c b/panels/user-accounts/um-realm-manager.c
index f4fec71..301c905 100644
--- a/panels/user-accounts/um-realm-manager.c
+++ b/panels/user-accounts/um-realm-manager.c
@@ -243,10 +243,10 @@ um_realm_manager_new_finish (GAsyncResult *result,
         }
 
         version = um_realm_provider_get_version (self->provider);
-        if (!version_compare (version, 0, 7)) {
+        if (version == NULL || !version_compare (version, 0, 7)) {
                 /* No need to bother translators with this temporary message */
                 g_set_error (error, UM_REALM_ERROR, UM_REALM_ERROR_GENERIC,
-                             "Unsupported version of realmd: %s", version);
+                             "realmd version should be at least 0.7");
                 g_object_unref (self);
                 return NULL;
         }