don't freak out when the queue is totally empty, as can happen when the music path is invalid or empty

music-api.py

@@ -668,10 +668,10 @@ def worker():
             # Repeat_one: loop the first track
             if repeat_mode == "repeat_one":
                 with queue_lock:
-                    current_track = queue[0]
-                path_current = os.path.join(MUSIC_DIR, current_track)
+                    current_track = queue[0] if queue else None
+                path_current = os.path.join(MUSIC_DIR, current_track) if current_track else None
                 set_rds(f"RT {current_track}")
-                played_ok = stream_file(path_current)
+                played_ok = stream_file(path_current) if path_current else False
                 write_silence(0.25)
                 with queue_lock:
                     current_track = None
@@ -680,13 +680,13 @@ def worker():
 
             # Normal / repeat_all
             with queue_lock:
-                current_track = queue[0]
-            path_current = os.path.join(MUSIC_DIR, current_track)
+                current_track = queue[0] if queue else None
+            path_current = os.path.join(MUSIC_DIR, current_track) if current_track else None
             set_rds(f"RT {current_track}")
 
             print(f"[WORKER] Starting: {current_track} | queue={queue} | skip={skip_flag} stop={stop_flag}")
 
-            played_ok = stream_file(path_current)
+            played_ok = stream_file(path_current) if path_current else False
 
             # Snapshot flags under lock to avoid races
             with queue_lock:
@@ -718,6 +718,12 @@ def worker():
                             print(f"[WORKER] Skip: popped {popped} | queue now {queue}")
                     write_silence(0.25)
                     continue
+                if not current_track:
+                    # there was no song to play
+                    write_silence(1)
+                    time.sleep(1)
+                    stop_flag = True
+                    continue
                 # Real failure: log and drop the track to avoid infinite loop
                 print("[WORKER] Track failed to play:", current_track)
                 with queue_lock: