Fixing a crash created by an earlier GLSL lighting fix for dynamic loading. When implementing the fix I forgot to check for materials that did not have a blender shader (ie, non GLSL materials).

source/gameengine/Ketsji/KX_BlenderMaterial.h

@@ -87,9 +87,12 @@ public:
 	);
 	
 	virtual void Replace_IScene(SCA_IScene *val)
+	{
+		if (mBlenderShader)
 		{
 			mScene= static_cast<KX_Scene *>(val);
 			mBlenderShader->SetScene(mScene);
+		}
 	};
 
 #ifndef DISABLE_PYTHON