RTSP: Continue setupTrack even if the other track creation fails

If there are errors during setupTrack 1, instead of throwing error,
let setupTrack 2 continue. This change ensures that the playback
continues with single track even if other track creation fails.

CRs-Fixed: 780254

Change-Id: I81b46257829e456d94ad3bae02f91a6b85c5dc3b