[folks] Make the 'Group invalidated' warning a debug statement.

[Travis Reitter <treitter src gnome org>]

commit fd58c8215239e2a0d6114e6cc970a038ac6e24b1
Author: Travis Reitter <travis reitter collabora co uk>
Date:   Wed Aug 18 09:11:34 2010 -0700

    Make the 'Group invalidated' warning a debug statement.
    
    This seems to only be printed when signing off of some accounts, so it doesn't
    deserve to be a warning.

 backends/telepathy/tpf-persona.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/backends/telepathy/tpf-persona.vala b/backends/telepathy/tpf-persona.vala
index f7f0c9d..35f9de7 100644
--- a/backends/telepathy/tpf-persona.vala
+++ b/backends/telepathy/tpf-persona.vala
@@ -262,7 +262,7 @@ public class Tpf.Persona : Folks.Persona,
                   (error.domain != TelepathyGLib.dbus_errors_quark () ||
                    error.code != TelepathyGLib.DBusError.OBJECT_REMOVED))
                 {
-                  warning ("Group invalidated: %s", error.message);
+                  debug ("Group invalidated: %s", error.message);
                 }
 
               this._change_group (group, false);