Ndk: Fixed warnings

Former-commit-id: 64509f0d59d83f4c04a09fe7e7913d94a940f191

SDK/src/NDK/EntityHandle.cpp

@@ -0,0 +1,10 @@
+// Copyright (C) 2015 Jérôme Leclercq
+// This file is part of the "Nazara Development Kit"
+// For conditions of distribution and use, see copyright notice in Prerequesites.hpp
+
+#include <NDK/EntityHandle.hpp>
+
+namespace Ndk
+{
+	const EntityHandle EntityHandle::InvalidHandle;
+}

SDK/src/NDK/World.cpp

@@ -79,7 +79,7 @@ namespace Ndk
 		else
 		{
 			NazaraError("Invalid ID");
-			return EntityHandle();
+			return EntityHandle::InvalidHandle;
 		}
 	}