[gcompris] shapegame: fixed a random crash in shapegame activities that happened while dragging a piece.

[Bruno Coudoin <bcoudoin src gnome org>]

commit f501baef3f8f1862671a6c2e57c680ebc7034fdb
Author: Bruno Coudoin <bruno coudoin free fr>
Date:   Thu Dec 29 17:47:08 2011 +0100

    shapegame: fixed a random crash in shapegame activities that happened while dragging a piece.

 src/babymatch-activity/shapegame.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/src/babymatch-activity/shapegame.c b/src/babymatch-activity/shapegame.c
index 4b34f71..a30c282 100644
--- a/src/babymatch-activity/shapegame.c
+++ b/src/babymatch-activity/shapegame.c
@@ -945,7 +945,7 @@ item_event_drag(GooCanvasItem *item,
   double item_x, item_y;
   Shape *found_shape;
 
-  if(board_paused)
+  if(board_paused || shape == NULL)
     return FALSE;
 
   switch(event->type)
@@ -1131,7 +1131,8 @@ item_event(GooCanvasItem *item, GooCanvasItem *target,
   if(!gcomprisBoard || board_paused)
     return FALSE;
 
-  g_assert(shape);
+  if (shape == NULL )
+    return FALSE;
 
   switch (event->type)
     {