{% block form_fieldset %}
{{ echo_block("form_fieldset_" ~ fieldset|classify|replace({'.': '_'})) }}
    <fieldset class="form_block form_fieldset_{{ fieldset|classify|replace({'.': '_'}) }} fieldset_tabbable">
        {% if "NONE" != fieldset %}
        <legend><span>{{ echo_trans(fieldset,{}, i18n_catalog is defined ? i18n_catalog : "Admin" ) }}</span></legend>
        {% endif %}
        {% for rows in builder.fieldsets[fieldset] %}
            <div class="row-fluid">
                {% for field in rows %}
                    {% if builder.Columns[field].credentials %}
                          {{ echo_if_granted(builder.Columns[field].credentials, builder.ModelClass) }}
                    {% endif %}
                    <div class="control-group form_field field_{{ builder.Columns[field].formType }} field_{{ field }}">
                        {{ echo_block("form_" ~ field) }}
                            {{ echo_twig("form_row(form['" ~ field ~ "'])") }}
                        {{ echo_endblock() }}
                    </div>
                    {% if builder.Columns[field].credentials %}
                        {{ echo_endif () }}
                    {% endif %}
                {% endfor %}
            </div>
        {% endfor %}
    </fieldset>
{{ echo_endblock() }}
{% endblock %}

{% block form_fieldset %}
{{ echo_block("form_fieldset_" ~ fieldset|classify|replace({'.': '_'})) }}
    <fieldset class="form_block form_fieldset_{{ fieldset|classify|replace({'.': '_'}) }} fieldset_tabbable">
        {% if "NONE" != fieldset[:4] %}
        <legend><span>{{ echo_trans(fieldset,{}, i18n_catalog is defined ? i18n_catalog : "Admin" ) }}</span></legend>
        {% endif %}
        {% for rows in builder.fieldsets[fieldset] %}
            <div class="row-fluid">
                {% for field in rows %}
                    {% if builder.Columns[field].credentials %}
                          {{ echo_if_granted(builder.Columns[field].credentials, builder.ModelClass) }}
                    {% endif %}
                    <div class="control-group form_field field_{{ builder.Columns[field].formType }} field_{{ field }}">
                        {{ echo_block("form_" ~ field) }}
                            {{ echo_twig("form_row(form['" ~ field ~ "'])") }}
                        {{ echo_endblock() }}
                    </div>
                    {% if builder.Columns[field].credentials %}
                        {{ echo_endif () }}
                    {% endif %}
                {% endfor %}
            </div>
        {% endfor %}
    </fieldset>
{{ echo_endblock() }}
{% endblock %}

Allow multiple "NONE" group for fieldset
Allow multiple "NONE" group for fieldset
