[XFA] Thread Print 2.1.2

Corrected bugs:

• ErrorException: Argument 1 passed to XFA_ThreadPrint_Model_Forum::canPrintThread() must be of the type array, boolean given

Corrected bug:

• Error when creating a node: ErrorException: Undefined index: node_id - library/XFA/ThreadPrint/Model/Forum.php:15

New features:

• Permission to print threads
• New option to add robot noindex,nofollow head tag to avoid potential duplicate content trigger