[folks] Don't add null Personas in personas-changed signal arguments.

[Travis Reitter <treitter src gnome org>]

commit d7514bc4c8d2772bb7d8e6f0baa6bb5407ab7f0c
Author: Travis Reitter <travis reitter collabora co uk>
Date:   Tue Jun 21 14:43:06 2011 -0700

    Don't add null Personas in personas-changed signal arguments.

 backends/telepathy/lib/tpf-persona-store.vala |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/backends/telepathy/lib/tpf-persona-store.vala b/backends/telepathy/lib/tpf-persona-store.vala
index 893698a..09b1fa8 100644
--- a/backends/telepathy/lib/tpf-persona-store.vala
+++ b/backends/telepathy/lib/tpf-persona-store.vala
@@ -865,7 +865,8 @@ public class Tpf.PersonaStore : Folks.PersonaStore
               Persona persona = this._add_persona_from_contact (contact, false);
 
               var personas = new HashSet<Persona> ();
-              personas.add (persona);
+              if (persona != null)
+                personas.add (persona);
 
               this._self_contact = contact;
               this._emit_personas_changed (personas, null);