[empathy/mc5] If the parameter wasn't known return NULL for the dbus signature

[Sjoerd Simons <sjoerds src gnome org>]

commit 4174547fb3fcc5d9447b20728a3fb086cf90b9e0
Author: Sjoerd Simons <sjoerd simons collabora co uk>
Date:   Sat Aug 22 17:31:15 2009 +0100

    If the parameter wasn't known return NULL for the dbus signature

 libempathy/empathy-account-settings.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/libempathy/empathy-account-settings.c b/libempathy/empathy-account-settings.c
index 6129570..f6c1af4 100644
--- a/libempathy/empathy-account-settings.c
+++ b/libempathy/empathy-account-settings.c
@@ -575,6 +575,9 @@ empathy_account_settings_get_dbus_signature (EmpathyAccountSettings *settings,
 
   p = empathy_account_settings_get_tp_param (settings, param);
 
+  if (p == NULL)
+    return NULL;
+
   return p->dbus_signature;
 }