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[Form] Update create_form_type_extension.rst #16599

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Mar 15, 2022
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[Form] Update create_form_type_extension.rst #16599

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2 changes: 1 addition & 1 deletion form/create_form_type_extension.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -192,7 +192,7 @@ Specifically, you need to override the ``file_widget`` block:

{% block file_widget %}
{{ block('form_widget') }}
{% if image_url is not null %}
{% if image_url is defined and image_url is not null %}
<img src="{{ asset(image_url) }}"/>
{% endif %}
{% endblock %}
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