Fix crash when skeleton debug mode is enabled

git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@8417 178a84e3-b1eb-0310-8ba1-8eac791a3b58

src/karts/kart_model.cpp

@@ -27,6 +27,8 @@
 #include "karts/kart.hpp"
 #include "utils/constants.hpp"
 
+#define SKELETON_DEBUG 1
+
 float KartModel::UNDEFINED = -99.9f;
 
 /** Default constructor which initialises all variables with defaults.
@@ -140,6 +142,12 @@ KartModel::~KartModel()
         }
     }
 
+#ifdef DEBUG
+#if SKELETON_DEBUG
+    irr_driver->debug_meshes.clear();
+#endif
+#endif
+    
 }  // ~KartModel
 
 // ----------------------------------------------------------------------------
@@ -185,8 +193,6 @@ KartModel* KartModel::makeCopy()
 
 // ----------------------------------------------------------------------------
 
-#define SKELETON_DEBUG 0
-
 /** Attach the kart model and wheels to the scene node.
  *  \return the node with the model attached
  */