Don't fail if Playlist.unload() is called on an unloaded Curve.

diff --git a/hooke/playlist.py b/hooke/playlist.py
index 69442da74fa63033980b942431ca04a3a8b84ae5..80d60fb462f78ceff0cdf419a5e3a5751e78bcce 100644 (file)
--- a/hooke/playlist.py
+++ b/hooke/playlist.py
@@ -203,7 +203,10 @@ class Playlist (NoteIndexList):
     def unload(self, curve):
         "Inverse of .`_setup_item`."
         curve.unload()
-        self._loaded.remove(curve)
+        try:
+            self._loaded.remove(curve)
+        except ValueError:
+            pass
 
 
 def playlist_path(path):