[longomatch] Fix exception with early redraws

[Andoni Morales Alastruey <amorales src gnome org>]

commit 1fe2c117ec4713092314e7b91e81e89163046679
Author: Andoni Morales Alastruey <ylatuya gmail com>
Date:   Tue Oct 21 12:42:17 2014 +0200

    Fix exception with early redraws

 .../CanvasObjects/PlayersTaggerObject.cs           |   12 ++++++++----
 1 files changed, 8 insertions(+), 4 deletions(-)
---
diff --git a/LongoMatch.Drawing/CanvasObjects/PlayersTaggerObject.cs 
b/LongoMatch.Drawing/CanvasObjects/PlayersTaggerObject.cs
index 796d15e..37da65f 100644
--- a/LongoMatch.Drawing/CanvasObjects/PlayersTaggerObject.cs
+++ b/LongoMatch.Drawing/CanvasObjects/PlayersTaggerObject.cs
@@ -335,11 +335,15 @@ namespace LongoMatch.Drawing.CanvasObjects
                public override void ResetDrawArea ()
                {
                        base.ResetDrawArea ();
-                       foreach (CanvasObject co in homePlayers) {
-                               co.ResetDrawArea ();
+                       if (homePlayers != null) {
+                               foreach (CanvasObject co in homePlayers) {
+                                       co.ResetDrawArea ();
+                               }
                        }
-                       foreach (CanvasObject co in awayPlayers) {
-                               co.ResetDrawArea ();
+                       if (awayPlayers != null) {
+                               foreach (CanvasObject co in awayPlayers) {
+                                       co.ResetDrawArea ();
+                               }
                        }
                        subPlayers.ResetDrawArea ();
                        subInjury.ResetDrawArea ();