[tasque] [tasque] Fix NRE on StatusIconTray.

[Antonius Riha <antoniusri src gnome org>]

commit 02e3d81cf80de0f535d063fefc4a822748c8c1f9
Author: Antonius Riha <antoniusriha gmail com>
Date:   Wed Aug 29 21:49:13 2012 +0200

    [tasque] Fix NRE on StatusIconTray.

 src/StatusIconTray.cs |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/StatusIconTray.cs b/src/StatusIconTray.cs
index b056b17..706ddb5 100644
--- a/src/StatusIconTray.cs
+++ b/src/StatusIconTray.cs
@@ -43,7 +43,8 @@ namespace Tasque
 		
 		protected override void OnTooltipChanged ()
 		{
-			tray.Tooltip = Tooltip;
+			if (tray != null)
+				tray.Tooltip = Tooltip;
 		}
 		
 		StatusIcon tray;