@Override
    public void onFilterChange(final String text) {
        filter = NullSafe.trim(text);
        if (filter.isEmpty()) {
            filter = null;
        }
        refresh();
    }
Set the user so the screen can only show one user. No quick filter is set.
Only use on an embedded Api keys list for ONE user.
stroom-core-client/src/main/java/stroom/security/client/presenter/ApiKeysListPresenter.java