Zjisteni existence chyb ve formulari

Ahoj, rad bych se zeptal jestli jde nejak v latte souboru zjistit jestli existuje naplneny inputError? :)

{form userInformationForm}
                <div class="box-body">
                        {foreach $form['userInformationForm']->components as $component}
                        {/foreach}
                        <div class="form-group">
                            {label username}
                            {input username class => 'form-control'}
                            <div class="help-block">{inputError username}</div>
                        </div>
                        <div class="form-group">
                            {label first_name}
                            {input first_name class => 'form-control'}
                            <div class="help-block">{inputError first_name}</div>
                        </div>
                        <div class="form-group">
                            {label last_name}
                            {input last_name class => 'form-control'}
                            <div class="help-block">{inputError last_name}</div>
                        </div>
                        <div class="form-group">
                            {label email}
                            {input email class => 'form-control'}
                            <div class="help-block">{inputError email}</div>
                        </div>
                        <div class="form-group">
                            {label address}
                            {input address class => 'form-control'}
                            <div class="help-block">{inputError email}</div>
                        </div>
                        <div class="form-group">
                            {label profile_image}
                            {input profile_image class => 'form-control'}
                            <div class="help-block">{inputError profile_image}</div>
                        </div>
                </div>
                <div class="box-footer">
                    {input submit class => 'btn btn-primary'}
                </div>
            {/form}

Mam tento kod a potreboval bych kazdemu inputu, kde je error pridat css class.
Nic me nenapada.

Diky moc za rady :)