dash: Don't crash if we don't have a valid mpdManager.

This will happen when the profil is invalid.
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
(cherry picked from commit 13002a34e61624fdf1092083625d511e15c41b63)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/stream_filter/dash/DASHManager.cpp

@@ -44,6 +44,8 @@ DASHManager::DASHManager    ( HTTPConnectionManager *conManager, MPD *mpd,
     mpd( mpd )
 {
     this->mpdManager        = mpd::MPDManagerFactory::create( mpd );
+    if ( this->mpdManager == NULL )
+        return ;
     this->adaptationLogic   = AdaptationLogicFactory::create( this->logicType, this->mpdManager );
     this->conManager->attach(this->adaptationLogic);
 }

modules/stream_filter/dash/dash.cpp

@@ -109,7 +109,8 @@ static int Open(vlc_object_t *p_obj)
             new dash::DASHManager( p_conManager, p_sys->p_mpd,
                                    dash::logic::IAdaptationLogic::RateBased );
 
-    if ( p_dashManager->getMpdManager()->getMPD() == NULL )
+    if ( p_dashManager->getMpdManager() == NULL ||
+         p_dashManager->getMpdManager()->getMPD() == NULL )
     {
         delete p_conManager;
         delete p_dashManager;