[longomatch] Fix exception redrawing before setting positions

[Andoni Morales Alastruey <amorales src gnome org>]

commit 7bd9a481cc893fc80d45f5d9aa5d697c6cf3a7f8
Author: Andoni Morales Alastruey <ylatuya gmail com>
Date:   Fri Aug 29 14:32:23 2014 +0200

    Fix exception redrawing before setting positions

 LongoMatch.Drawing/CanvasObjects/BenchObject.cs |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/LongoMatch.Drawing/CanvasObjects/BenchObject.cs b/LongoMatch.Drawing/CanvasObjects/BenchObject.cs
index 323fa99..832bfc1 100644
--- a/LongoMatch.Drawing/CanvasObjects/BenchObject.cs
+++ b/LongoMatch.Drawing/CanvasObjects/BenchObject.cs
@@ -86,7 +86,7 @@ namespace LongoMatch.Drawing.CanvasObjects
 
                public override void Draw (IDrawingToolkit tk, Area area)
                {
-                       if (BenchPlayers == null) {
+                       if (BenchPlayers == null || Position == null) {
                                return;
                        }
                        tk.Begin ();
@@ -111,7 +111,7 @@ namespace LongoMatch.Drawing.CanvasObjects
                {
                        Selection selection = null;
 
-                       if (BenchPlayers == null) {
+                       if (BenchPlayers == null || Position == null) {
                                return selection;
                        }