[cheese] Partially removed warnings that appeared during effect switching

[Yuvaraj Pandian <yuvipanda src gnome org>]

commit 6e72f350a08f5f15194246f89a63eae74cb52b68
Author: Yuvaraj Pandian T <yuvipanda gmail com>
Date:   Sun Aug 1 03:07:17 2010 +0530

    Partially removed warnings that appeared during effect switching

 src/cheese-window.vala |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/cheese-window.vala b/src/cheese-window.vala
index f92fdf8..21e2aa5 100644
--- a/src/cheese-window.vala
+++ b/src/cheese-window.vala
@@ -696,7 +696,8 @@ public class Cheese.MainWindow : Gtk.Window
       }
       else
       {
-        effect.disable_preview ();
+        if (effect.is_preview_connected ())
+          effect.disable_preview ();
       }
     }
     setup_effects_page_switch_sensitivity ();