Fix bin/accountadmin when not making changes

Summary: If you go through the `accountadmin` flow and change nothing, you get an exception about the transaction not having any effect. Instead, let the `applyTransactions` call continue even on no effect.

Test Plan: Ran `accountadmin` without changing anything for an existing user. No longer got an exception about no-effect transactions.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D20009

scripts/user/account_admin.php

@@ -218,6 +218,7 @@ $user->openTransaction();
     ->setActor($actor)
     ->setActingAsPHID($people_application_phid)
     ->setContentSource($content_source)
+    ->setContinueOnNoEffect(true)
     ->setContinueOnMissingFields(true);
 
   $transaction_editor->applyTransactions($user, $xactions);