XenForo Redirects for vBulletin 1.1.9

This version catches the error that is (intentionally) thrown when a redirect is attempted prior to the import log table having been configured.

The exception is still logged to the admin server error log.

Previously, this add-on excluded XFMG tables from its list available for selection as the import log table, but this added an unneccessary dependency, so I've removed it.

This version won't throw an error when you point it to an import table generated by XenForo 1.