R1:c756bf347617

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.