bug fix: re-added a check (output!=0) which had been removed by revision 51.

git-svn-id: http://svn.berlios.de/svnroot/repos/sems/trunk@67 8eb893ce-cfd4-0310-b710-fb5ebe64c474

core/AmSessionScheduler.cpp

@@ -260,7 +260,7 @@ void AmSessionSchedulerThread::processAudio(unsigned int ts)
 	s->lockAudio();
 	AmAudio* output = s->getOutput();
 	    
-	if(s->rtp_str.sendIntReached()){
+	if(output && s->rtp_str.sendIntReached()){
 		
 	    int size = output->get(ts,buffer,s->rtp_str.getFrameSize());
 	    if(size <= 0){