Iss #19 - Add SDV playlist, fix errors from missing playlists

In addition to adding the SDV playlist, a fix was added to reduce the severity of missing Youtube playlists. Previously, a missing or broken playlist association would error out the precaches, which would break the server starting. As this service is meant to be long running and support multiple tracks, a single channel being out of commission should not stop the service from starting

Resolves #19 (closed)