[folks] Ensure we prepare all TpAccounts before trying to use them.

[Travis Reitter <treitter src gnome org>]

commit e2e49f92dab827ca283b458af59c09e9c4053345
Author: Philip Withnall <philip tecnocode co uk>
Date:   Mon Sep 26 15:36:39 2011 -0700

    Ensure we prepare all TpAccounts before trying to use them.
    
    Helps: bgo#659041 - tpf-persona-store.vala: try to connect to a NULL object

 backends/telepathy/lib/tpf-persona-store.vala |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/backends/telepathy/lib/tpf-persona-store.vala b/backends/telepathy/lib/tpf-persona-store.vala
index 3ee7402..fb7363b 100644
--- a/backends/telepathy/lib/tpf-persona-store.vala
+++ b/backends/telepathy/lib/tpf-persona-store.vala
@@ -533,7 +533,7 @@ public class Tpf.PersonaStore : Folks.PersonaStore
    *
    * See { link Folks.PersonaStore.prepare}.
    */
-  public override async void prepare ()
+  public override async void prepare () throws GLib.Error
     {
       lock (this._is_prepared)
         {
@@ -580,6 +580,9 @@ public class Tpf.PersonaStore : Folks.PersonaStore
                   this._logger = null;
                 }
 
+              /* Ensure the account's prepared first. */
+              yield this.account.prepare_async (null);
+
               this.account.status_changed.connect (
                   this._account_status_changed_cb);