BUG: [2.1] saving a new page without add content block ends in exception

[crydotsnake]

Description
Currently when you want to add a new page, and try too save without adding content to it, it ends in an exception:

An error occurred during rendering the "show_in_shop" hook in the "sylius_admin.page.create.content.header.title_block.actions" hookable. An exception has been thrown during the rendering of a template ("Doctrine\Common\Collections\ArrayCollection::get(): Argument #1 ($key) must be of type string|int, null given, called in /var/www/html/vendor/sylius/resource-bundle/src/Component/src/Model/TranslatableTrait.php on line 72") in @MonsieurBizSyliusCmsPagePlugin/admin/page/update/content/header/title_block/actions/show_in_shop.html.twig at line 46 in @MonsieurBizSyliusCmsPagePlugin/admin/page/update/content/header/title_block/actions/show_in_shop.html.twig at line 46

Since the field Page content => Content is required, I would assume that it should show me a hint that its required. Basically the same behavior when you leave the title or slug field empty.

Versions
Sylius: 2.7.1
SyliusCmsPagePlugin: 2.1.0

[Rikijs]

I am confirming described behaviour!
Getting exception if page content is left empty.

[crydotsnake]

I found out that the content block is validated!

The error appears when you leave the title empty.