Ensure stageEmail doesn't pass undefined args.

    If a user is staging a second secondary email, then the stageEmail call
    will not include a hash. We must explicitly null this out, otherwise
    the QueryParser barfs.
Fix adding secondaries to accounts.

    Yet another spot where the code was checking for *existence* with a strong
    type check. I kinda think this illustrates the evils of using jshint.