Fix Missing Content Type 1.0.2

This addon solves the problem of server errors caused by Xenforo not recognising custom content types after an addon which creates them has been disabled/uninstalled.

Some addons (such as Competitions by M2N) make use of Xenforo's custom content types. These are alternatives to discussion/question/article thread types.
The Problem:
The problem is that Xenforo itself does not cater for when these addons are disabled/uninstalled, leaving custom content types behind. Xenforo doesn't know what to do with these 'orphaned' custom content types and throws server errors.
The Solution:
This addon makes Xenforo see these orphaned custom content types as normal discussion threads, stopping the errors.
Even better, when the addons are re-enabled or re-installed, those discussion threads are then seen as the custom content types again.

This addon has to be installed after an addon which creates custom content types has been disabled or uninstalled.