How to use django-widget-tweaks with MultipleChoiceField field?

[nurzhannogerbek]

1 QUESTION: How to use django-tweaks with MultipleChoiceField field?

2QUESTION: I have form with MultipleChoiceField field which has dynamic list for choices. Sometimes dynamic list can be empty []. So I want to show message in template when its empty but next code didnt show message.

forms.py:

class RequirementForm(forms.ModelForm):
    symbol = forms.MultipleChoiceField(widget=forms.CheckboxSelectMultiple)

    class Meta:
        model = Requirement
        fields = ('symbol',)

requirement_add.html:

{% load widget_tweaks %}
<form method="post" action="{% url 'project:requirement_add' project_code=project.code %}">
        {% for field in form %}
                {% render_field field class="form-control" %}
        {% empty %}
            <p>Form is empty!</p>
        {% endfor %}
</form>

[zodman]

https://github.com/jazzband/django-widget-tweaks#not-supported