Possible null pointer dereference

[AppChecker]

Hello.

It seems, possible method call on null object in simplePollController.php:
if ($timeblock == null || ....) {
$timeblock->update();
}

This possible defect found by AppChecker (http://cnpo.ru/en/solutions/appchecker.php)

[dleffler]

Closed Feb 12th with code change.