Fix poss. crash on /<room>/musicsearch/spotify/song/ related to available_markets (#647)
Fix poss. crash on /<room>/musicsearch/spotify/song/ related to available_markets (#647)

When I used
'http://localhost:5005/Office/musicsearch/spotify/song/red+hot+chili+peppers'
straight from the docs, it was crashing because there was no
"track.available_markets" data.

This may be because I specifed a non-commercial app when I generated my
spotify clientId + secret?  Anyway, this forgoes the available_markets
checking if the data is not there.
jzajac2/node-sonos-http-api,jishi/node-sonos-http-api,jzajac2/node-sonos-http-api,jzajac2/node-sonos-http-api,jishi/node-sonos-http-api