Fix Creation of a Page From a Blank Template

[adrians5j]

Changes

This PR updates the default value of the content field of a page template:

const getDefaultContent = () => {
    return {
        id: uniqid.time(),
        type: "document",
        data: {
            // ℹ️ Added `template.variables` array here.
            template: {
                variables: []
            }
        },
        elements: []
    };
};

Without this, the template content resolution happening in the content GraphQL field would fail, because the process is expecting the template.variables array to be present.

How Has This Been Tested?

Manually.

Documentation

Changelog.