[tomboy] Fix crash when showing Search from panel applet (bug #595098)

[Sanford Armstrong <sharm src gnome org>]

commit b3f88ce550b640ff496ae6a7a60b7bad2c3c35b9
Author: Sandy Armstrong <sanfordarmstrong gmail com>
Date:   Mon Sep 14 10:15:52 2009 -0700

    Fix crash when showing Search from panel applet (bug #595098)

 Tomboy/Tomboy.cs |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/Tomboy/Tomboy.cs b/Tomboy/Tomboy.cs
index 92767bc..8e2a2c5 100644
--- a/Tomboy/Tomboy.cs
+++ b/Tomboy/Tomboy.cs
@@ -419,7 +419,8 @@ namespace Tomboy
 		public static bool TrayIconShowing
 		{
 			get {
-				tray_icon_showing = tray_icon.IsEmbedded && tray_icon.Visible;
+				tray_icon_showing = !is_panel_applet && tray_icon != null &&
+					tray_icon.IsEmbedded && tray_icon.Visible;
 				return tray_icon_showing;
 			}
 		}