video_rtp_session: prevent nullptr dereference

Also removes log message.

Change-Id: I5fc4dff440641f604f7f522d8319523715f4ef89

src/media/video/video_rtp_session.cpp

@@ -419,9 +419,8 @@ VideoRtpSession::adaptQualityAndBitrate()
     //Take action only when two successive drop superior to 5% are catched...
     //and when jitter is less than 1 seconds
     auto pondLoss = getPonderateLoss(rtcpi.packetLoss);
-    JAMI_DBG("[AutoAdapt] Pondloss: %f%, last loss: %f%", pondLoss, rtcpi.packetLoss);
-    if(pondLoss >= 5.0f)
-    {
+    //JAMI_DBG("[AutoAdapt] Pondloss: %f%%, last loss: %f%%", pondLoss, rtcpi.packetLoss);
+    if(pondLoss >= 5.0f) {
         videoBitrateInfo_.videoBitrateCurrent =  videoBitrateInfo_.videoBitrateCurrent * (1.0f - rtcpi.packetLoss/200.0f);
         JAMI_DBG("[AutoAdapt] pondLoss: %f%%, packet loss rate: %f%%, decrease bitrate from %d Kbps to %d Kbps, ratio %f", pondLoss, rtcpi.packetLoss, oldBitrate, videoBitrateInfo_.videoBitrateCurrent, (float) videoBitrateInfo_.videoBitrateCurrent / oldBitrate);
         histoLoss_.clear();
@@ -434,7 +433,7 @@ VideoRtpSession::adaptQualityAndBitrate()
         storeVideoBitrateInfo();
 
         // If encoder no longer exist do nothing
-        if(sender_->setBitrate(videoBitrateInfo_.videoBitrateCurrent) == 0)
+        if(sender_ && sender_->setBitrate(videoBitrateInfo_.videoBitrateCurrent) == 0)
             lastMediaRestart_ = now;
     }
 }