Fix #146. Consumer: Do not access 'rtpStream' when disabled
Fix #146. Consumer: Do not access 'rtpStream' when disabled

When the Consumer is disabled 'rtpStream' is nullptr.

ibc/MediaSoup,versatica/mediasoup,versatica/mediasoup,versatica/mediasoup,ibc/MediaSoup,versatica/mediasoup,versatica/mediasoup,versatica/mediasoup,versatica/mediasoup,ibc/MediaSoup,versatica/mediasoup,versatica/mediasoup