Message checker live updates work again

* I broke them at Ie7e265330 about six months ago
* Code was returning nulls which causes JavaScript errors, which were not
  visible before new jQuery was enabled without migration module
* There were two different places calling delay() causing interference
* jQuery -> $

Change-Id: I0404dcace2bad6a86fb6cb7ed19502809034f6f5
Merge "Message checker live updates work again"