Fixed manual bindings' ForEachXXX mapping not checking the object instance for validity.

( http://forum.mc-server.org/showthread.php?tid=591&pid=5007#pid5007 )

git-svn-id: http://mc-server.googlecode.com/svn/trunk@996 0a769ca7-a7f5-676a-18bf-c427514a06d6

source/ManualBindings.cpp

@@ -392,6 +392,11 @@ static int FNNAME(lua_State * tolua_S) \
 	} \
 	\
 	CONTAINER * self = (CONTAINER *)  tolua_tousertype(tolua_S, 1, 0); \
+	if (self == NULL) \
+	{ \
+		LOGWARN("Error in function call '" #FOREACH "': Not called on an object instance"); \
+		return 0; \
+	} \
 	\
 	if (!lua_isfunction( tolua_S, 2)) \
 	{ \