New 'handle event' events break upgrade

[Robert Lyon]

We need to wrap some bits in if(!defined('INSTALLER')) { ... }

[Mahara Bot (dev-mahara)]

Patch for "master" branch: https://reviews.mahara.org/8044

[Robert Lyon (robertl-9)]

To Test: Try upgrading from 15.04 site to 17.10

Without patch - will fail as some db structure is missing

With patch - should upgrade fine

[Mahara Bot (dev-mahara)]

Reviewed: https://reviews.mahara.org/8044
Committed: https://git.mahara.org/mahara/mahara/commit/8c590b1399aae00d66b34c1da675d65f119f51e8
Submitter: Robert Lyon (<email address hidden>)
Branch: master

commit 8c590b1399aae00d66b34c1da675d65f119f51e8
Author: Robert Lyon <email address hidden>
Date: Thu Sep 21 14:08:00 2017 +1200

Bug 1718562: Stop the install/upgrade system from doing 'handle_event()'

As we don't need to record user interation at this point and it breaks
things on upgrade from old systems as some of the
tables/columns/sequences do not exist

behatnotneeded

Change-Id: I7d6f8969f9b94ba93761c0c25303e2e4916fa778
Signed-off-by: Robert Lyon <email address hidden>