[gnome-music] widgets: Fix IndexError when a user cancels new playlist dialog

[Vadim Rutkovsky <vrutkovsky src gnome org>]

commit 8e17c6c389a16a57397d7943c2fa93cea4c3c2a9
Author: Sagar Ghuge <ghugesss gmail com>
Date:   Fri Jan 2 15:37:27 2015 +0530

    widgets: Fix IndexError when a user cancels new playlist dialog
    
    https://bugzilla.gnome.org/show_bug.cgi?id=742123

 gnomemusic/widgets.py |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)
---
diff --git a/gnomemusic/widgets.py b/gnomemusic/widgets.py
index e9f0088..6f06eb2 100644
--- a/gnomemusic/widgets.py
+++ b/gnomemusic/widgets.py
@@ -743,7 +743,8 @@ class PlaylistDialog():
     @log
     def _on_playlist_created(self, playlists, item):
         new_iter = self._add_item_to_model(item)
-        self.view.set_cursor(self.model.get_path(new_iter),
-                             self.view.get_columns()[0], False)
-        self.view.row_activated(self.model.get_path(new_iter),
-                                self.view.get_columns()[0])
+        if self.view.get_columns():
+            self.view.set_cursor(self.model.get_path(new_iter),
+                                 self.view.get_columns()[0], False)
+            self.view.row_activated(self.model.get_path(new_iter),
+                                    self.view.get_columns()[0])