BETA: Fixed an `IndexOutOfBoundsException` in `HandysBlockCheckerManager`.

Reported by: St3et
Tested by: St3et

git-svn-id: http://svn.l2jserver.com/branches/unstable/L2J_Server_BETA@6360 d34dfa0f-f91c-0410-86dd-cf06f19dd0ad