[ResourceBundle] Check if collection form prototype is defined

[adamelso]

Q	A
Bug fix?	yes
New feature?	no
BC breaks?	no
Deprecations?	no
Fixed tickets	n/a
License	MIT
Doc PR	n/a

If you specify allow_add to false when building a form collection property, this will result in a Twig error:

Variable "prototype" does not exist

In the same form theme template, a check is done to see prototype is defined and allow_add is true on part of the template, so this same has been done here to fix this issue.

public function buildForm(FormBuilderInterface $builder, array $options)
{
        $builder ->add('attributes', 'collection', [
                'required'     => false,
                'type'         => 'sylius_advertisement_attribute_value',
                'allow_add'    => false,
                'allow_delete' => false,
                'by_reference' => false
        ]);

[TeatroIO]

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[pjedrzejewski]

Thank you Adam! 👍