[empathy] get_tp_contact_for_chat: deal with tp_channel_borrow_connection() returning NULL

[Guillaume Desmottes <gdesmott src gnome org>]

commit 5d4aca9915e38194a22b27028d99509f09f7c222
Author: Guillaume Desmottes <guillaume desmottes collabora co uk>
Date:   Fri Oct 28 10:17:28 2011 +0200

    get_tp_contact_for_chat: deal with tp_channel_borrow_connection() returning NULL
    
    https://bugzilla.gnome.org/show_bug.cgi?id=662873

 src/empathy-invite-participant-dialog.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/empathy-invite-participant-dialog.c b/src/empathy-invite-participant-dialog.c
index f905c82..ece86f1 100644
--- a/src/empathy-invite-participant-dialog.c
+++ b/src/empathy-invite-participant-dialog.c
@@ -114,6 +114,8 @@ get_tp_contact_for_chat (EmpathyInviteParticipantDialog *self,
   TpConnection *chat_conn;
 
   chat_conn = tp_channel_borrow_connection (TP_CHANNEL (self->priv->tp_chat));
+  if (chat_conn == NULL)
+    return NULL;
 
   return empathy_get_tp_contact_for_individual (individual, chat_conn);
 }