Bug 717196: Fixing install process

Change-Id: I7b43663a2e1438556b4bff7af19462f882d7d421
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>

htdocs/init.php

@@ -498,7 +498,7 @@ if (!defined('INSTALLER')) {
     }
 }
 
-if (!defined('INSTALLER')) {
+if (get_config('installed')) {
     // Check if we need to set/unset isolated institution related things
     is_isolated();
 }