[gnome-music] Select button should be sensitive only if playlist count is greater than 0.

[Vadim Rutkovsky <vrutkovsky src gnome org>]

commit 1eee29b92613b3137fd0f32ce27c196bd3f9cdce
Author: Sai Suman Prayaga <suman sai14 gmail com>
Date:   Fri Apr 4 14:07:33 2014 +0530

    Select button should be sensitive only if playlist count is greater than 0.

 gnomemusic/widgets.py |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gnomemusic/widgets.py b/gnomemusic/widgets.py
index 3f5b3e5..ff34e57 100644
--- a/gnomemusic/widgets.py
+++ b/gnomemusic/widgets.py
@@ -637,6 +637,7 @@ class PlaylistDialog():
 
         self._cancel_button = self.ui.get_object('cancel-button')
         self._select_button = self.ui.get_object('select-button')
+        self._select_button.set_sensitive(len(playlist_names) > 0)
         self._cancel_button.connect('clicked', self._on_cancel_button_clicked)
         self._select_button.connect('clicked', self._on_selection)