[ekiga] Fixed a crash on some calls

[Julien Puydt <jpuydt src gnome org>]

commit 4b84405d04b8b4768b1ffbb69b834c71334f6a70
Author: Julien Puydt <jpuydt gnome org>
Date:   Tue May 19 21:48:44 2009 +0200

    Fixed a crash on some calls
    
    The problem is that a std::string was built from a pointer without checking for NULL
---
 lib/engine/components/opal/opal-call-manager.cpp |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/lib/engine/components/opal/opal-call-manager.cpp b/lib/engine/components/opal/opal-call-manager.cpp
index b5c577d..816445c 100644
--- a/lib/engine/components/opal/opal-call-manager.cpp
+++ b/lib/engine/components/opal/opal-call-manager.cpp
@@ -634,7 +634,12 @@ OpalCall *CallManager::CreateCall (void *uri)
 {
   gmref_ptr<Ekiga::CallCore> call_core = core.get ("call-core"); // FIXME: threaded?
 
-  gmref_ptr<Opal::Call> call (new Opal::Call (*this, core, (const char *) uri));
+  gmref_ptr<Opal::Call> call;
+
+  if (uri != 0)
+    call = gmref_ptr<Opal::Call> (new Opal::Call (*this, core, (const char *) uri));
+  else
+    call = gmref_ptr<Opal::Call> (new Opal::Call (*this, core, ""));
   call_core->add_call (call, gmref_ptr<CallManager>(this));
 
   return call.get ();