[ekiga/gnome-2-26] Fixed crash in presence

[Julien Puydt <jpuydt src gnome org>]

commit 2bb790cccd34a0a03051b769bb121a40c5c74e32
Author: Julien Puydt <jpuydt gnome org>
Date:   Wed Jun 3 15:15:37 2009 +0200

    Fixed crash in presence
    
    The problem is that the Ekiga::URIPresentity objects are last to get disposed of... that's a shutdown problem which I thought was just theoretical -- and now we have a practical crash
---
 lib/engine/presence/uri-presentity.cpp |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/lib/engine/presence/uri-presentity.cpp b/lib/engine/presence/uri-presentity.cpp
index ddaf972..a7a750b 100644
--- a/lib/engine/presence/uri-presentity.cpp
+++ b/lib/engine/presence/uri-presentity.cpp
@@ -50,7 +50,8 @@ Ekiga::URIPresentity::URIPresentity (Ekiga::ServiceCore &_core,
 Ekiga::URIPresentity::~URIPresentity ()
 {
   gmref_ptr<Ekiga::PresenceCore> presence_core = core.get ("presence-core");
-  presence_core->unfetch_presence (uri);
+  if (presence_core)
+    presence_core->unfetch_presence (uri);
 }
 
 const std::string