Add is_nil() and is_number() to LuaStack

engine/lua/LuaStack.h

@@ -126,6 +126,18 @@ public:
 		lua_remove(m_L, index);
 	}
 
+	//-----------------------------------------------------------------------------
+	bool is_nil(int32_t index)
+	{
+		return lua_isnil(m_L, index);
+	}
+
+	//-----------------------------------------------------------------------------
+	bool is_number(int32_t index)
+	{
+		return lua_isnumber(m_L, index);
+	}
+
 	//-----------------------------------------------------------------------------
 	void push_nil()
 	{