Anyway to make blocking requests?

I'm using this for an Alexa skill that will allow searching the DB artists and play the results. However, this is all done in the processing of an user request and I would like to first check whether there are any results before clearing the playlist. However, since this library uses callback for commands, the callback runs after I've processed the end-user request. Any way to make the mpd request blocking?

This is the code in question if you're interested: https://github.com/guikubivan/alexa-mpd-control/blob/master/mpd_interface.js#L39