add settings dialog radio for saving queue locally or to server

backend/mediaprovider/subsonic/subsonicmediaprovider.go

@@ -382,6 +382,9 @@ func (s *subsonicMediaProvider) GetLyrics(track *mediaprovider.Track) (*mediapro
 // CanSavePlayQueue interface
 
 func (s *subsonicMediaProvider) SavePlayQueue(trackIDs []string, currentTrackPos int, timeSeconds int) error {
+	if len(trackIDs) == 0 {
+		return nil // don't save an empty queue
+	}
 	return s.client.SavePlayQueue(trackIDs, map[string]string{
 		"current":  trackIDs[currentTrackPos],
 		"position": strconv.Itoa(timeSeconds * 1000),

backend/savedplayqueue.go

@@ -3,6 +3,7 @@ package backend
 import (
 	"encoding/json"
 	"errors"
+	"log"
 	"os"
 
 	"github.com/dweymouth/supersonic/backend/mediaprovider"
@@ -64,6 +65,8 @@ func LoadPlayQueue(filepath string, sm *ServerManager, loadFromServer bool) (*Sa
 				TrackIndex: queue.TrackPos,
 				TimePos:    float64(queue.TimePos),
 			}, nil
+		} else {
+			log.Printf("error loading queue from server: %v", err.Error())
 		}
 	}