[gnome-control-center] user-accounts: Show username when no real name

[Bastien Nocera <hadess src gnome org>]

commit b435556cd33d1536d452af0f49cfddbb9be9b923
Author: Bastien Nocera <hadess hadess net>
Date:   Thu Apr 28 14:14:18 2011 +0100

    user-accounts: Show username when no real name
    
    So that users added "by hand" with adduser show up correctly
    in the treeview.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=648348

 panels/user-accounts/um-user.c |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)
---
diff --git a/panels/user-accounts/um-user.c b/panels/user-accounts/um-user.c
index 87aad57..0693895 100644
--- a/panels/user-accounts/um-user.c
+++ b/panels/user-accounts/um-user.c
@@ -275,8 +275,13 @@ um_user_get_display_name (UmUser *user)
 {
         g_return_val_if_fail (UM_IS_USER (user), NULL);
 
-       return user->display_name ? user->display_name
-                                 : user->props->real_name;
+        if (user->display_name)
+                return user->display_name;
+        if (user->props->real_name &&
+            *user->props->real_name != '\0')
+                return user->props->real_name;
+
+        return user->props->user_name;
 }
 
 const gchar *