Fix coalesce warning

[airbundle] / Resources / views / application / add.html.twig

{% extends '@RapsysAir/base.html.twig' %}
{% block content %}
        <section id="form">
                <header>
                        <h2>{{ title.page }}</h2>
                        <p>{{ description }}</p>
                </header>
                {{ form_start(form) }}
                        <div>
                                {% if form.user is defined %}
                                        {{ form_row(form.user) }}
                                {% endif %}

                                {{ form_row(form.dance) }}

                                {{ form_row(form.location) }}

                                {{ form_row(form.date) }}

                                {{ form_row(form.slot) }}

                                {{ form_row(form.submit) }}
                        </div>

                        {# render csrf token etc .#}
                        <footer style="display:none">{{ form_rest(form) }}</footer>
                {{ form_end(form) }}
        </section>
{% endblock %}